初中数学解一元一次方程专项练习题200题汇编附答案解析.docx
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初中数学解一元一次方程专项练习题200题汇编附答案解析
解一元一次方程专项练习200题(附答案)
(7)
XX—x-L=—
3147
(3)
3_
4
(72)聖散2過,
(13)0.6x+90%x=78,
(14)20%x-2.4x3^0.8
(4)
2x^13.6
8x2.5
⑴)聖評42,
(5)0.78:
x=3:
5‘
(16)0.6x+3x2.5=67.5,
(6)1-20%x=0.4,
(77)儈
x0.45)=
(10)9x3-
1.7x^13.4,
(18)x2.25^8.25,
(79)三:
x=3:
12,
4
(20
+0.8=5.6,
(11)x-25%x=24>
(32)6x-0.9=45>
(21)1.4:
x=1:
0.75,
(33)2(x・3)=5.8”
(34)1.6x^6.4>
(24)12x+7x0.3^20.1,
(35)4x・3x9=29,
(25)护肆十
(36)16+8x^40,
(26)x:
42浮10,
(37)
(27)即®評筍'
(28)
。
详。
•您
⑴)焉<3-7+,
(29)x-
(40)¥1-冷
5)42:
树
(37)5*0.4=75%>
18
19
(54)
43)风三°・,
722.4
爭(7-2.8x)=1.5,
(55)
x:
0.3吕3,
93
(56)
150%x+66=99
45)垄=2:
2
x1015
(57)x+6-0.8xT6
(47)x一薯+厂
(48)125%X+25%x=3+25%
4
当(一5紘二5・5
(59)5
x,
1.25.X
0.2517^
(49)
(60)(X总)=).3
X=2xi
105
(50)
(67)(X+0.5):
2-1=(X4):
2
24
(62)XtO.05=3.528>
(51)5:
8=x:
32,
(63)2X4x6=80,
(52)2x+3x0.9=24.9>
(64)4x453X=6.38>
(53)5,3x2.9會,
(75)
(76)x
(66)11.5X^20,
(77)200:
6=x:
12
—9
5
(67)3.8x12+15X^87.6‘
(78),
5
(79)8(x-2)=2(x+7),
(68)6X+5T7,
(69)0.6x(2.5+X)
=4.2,
(80)吕:
78%=:
竽'
4
r
〔87)
2
(70)
3•2—y.8—・^—A・—
4315
(力)
271845
—x+—x=46,
54
(82)
(72)
314
T5F
(73)
(74)4*
吨,
(84
2x
(85)5(3x-4)-2(X-1)=5(2x-1)
(86)
(87)8(2X7)=5
(X+13)‘
(97)§:
x=0.3:
12‘
4
(98)4x+2(&x)=26>
(88)3(x+4.5)=60,
(99)务淤,
(89)1.6x+2.4=7.52>
(100)-+-x=r>
55
(⑹)XX(餐)需
(90)3(x・08)=6.3,
(91)28.45x=5.8,
(103)
(92吩
3
25
(93)却,
(106)5x+35=650,
(105)xx注二晶、
5Z
(94)吕"仍%,
(95)f珂'
(96)x+50%x=6,
(107)720^3x^80>
(118)3x-70%x=9・2,
(108)3.6x-0.9x=8•八
(109)4x4.53x=6,
(119)6+^240,
5
(720)2250.4x^12.5>
110)乎證
(⑵)x*4:
空,
(111)6x3-f.8X=7.2>
(122)x0.8x6“6>
(“w‘
(113)xm各42,
(114)
(115)7x^3=8.19,
(116)12:
0.6=x:
4,
厶
(777)3(x+2)=4
(x+O,
(127)xx50%气x=5,
(139)6x7+3x=69>
(729)2曲耕吟
(140)6x+2x56=0,
(143)8•令(9-x)=3>
(144)3xrL2=8,
(141)3x-0.45x4^2.7>
(142)5.8x4.6x=0・96,
(732)3^x=4,
6
(133)Ex-5%=17.54>
4
(皿)寺段:
(4一
(135)6x+31=49,
(145)5x+28=7厂
(136)7x^8.19,
(146)8.77.2x=3.9,
(137)32.89x“7.5,
(147)8*2.6x^37.8>
(138)x-0.36x^16>
(148)0.75x-0.95x4^8.5>
(149)54^2+3x^72,
(150)
8x2.6^37.8>
(151)
(752)
x+30%x=26,
(753)
7.83x=3.6>
6x3-1.8x=7.2,
(755)
10:
x=4.5:
0.8,
(156)
(157)X・7.65^4.64,
(158)28.25X=8.25,
(162)x80%x=48、
(163)75%x-5x邑6,5
(164)x6.8=15.4»
(765)1.9x=5.7»
(166)4.3yy=4.6>
(167)5x+2.6=7.6,
(168)x-1.5=12.9»
(169)9x+5x=8.4,
(170)6.8+3.2x^14.8,
(759)X(3.6+2.97)
=12.42>
(171)
(160)冬、
38
(767)疳-14.5=5.5>
8
(773)4.5j-电x“・5.
(174)(1+25%)x=0.5,
(186)3(x-2)=25(x-2),
(175)x40%x=9,
(187)4x・3(20x)+4=0,
(176)xx20%^15.2,
(閒竽宁厂
(189)4x・5x6=72,
(178)
(779)
(180
(190)8x-3x^15.6‘
2x^75%=3‘
3
4x・〒><14二2・4,
(797)30x(x詔)=60,
(他)申氓:
4・5,
(192)7.2x0・5-3x^1.2‘
(182)(x-4.5)
x6=12.5‘
(193)5x-2.4x5=8,
(183)27-17x^13.4>
(784)9.6+3x^3.24^5,
(185)2x+5=5x・7,
(194)鱼+绻玄2,
548
(195)5x+2.4^15=66,
(196)3.2x+2.8x・x=7,
(197)2.5^16-8x^12,
(198)963x=6・3,
(799)5(x+6)=75,
(200)xtO.7+0.9x3=4,
io
(8)“(*g)=6,
(9)
答案:
乙
"(X-X(x-^)=6x(X-1)
7=6x(x-—)
2
6x6x2=7,
2
6x-3=1»
6x=4,
6xt6=4t6,
(10)2x—x=1.2‘
5
x(Z|)“2,
曲,
冬;%•以,
3i
-4x+4x=—+4x,
46
555
x=1;
(4)8x2.52x=13.6
202x=13.6»
13.6+2X=20,
2X=6.4,
x=3.2;
(5)0.78:
x=3:
5»
3x=0.78x5,
3x=3.9,
x=1.3
(6)1-20%x=0.4,
120%x+20%x“・4十20%x,
0.4+20%x=1>
0.4^20%x-0.4=10.4,20%x=0.6,
20%xxJM=0.6x也,
2020
x=3;
(11)9x3-1.7x=13.4,
27-1.7x=13.4,
277.7x+7・7x=73・4+7.7x,
13.4+1.7x=27>
73.4+7.7x13.4=27
13.4,
1.7x=13.6,
1.7x^1.7=13.6t1.7,
x=8
(12)x-25%x=24,
75%x=24,
75%x^75%=24^75%,
x=32;
刍-0.6+0.6^0.6>
42
茄更,
410
(13)0.6x+90%x=78,
1.5x=78,
1.5x^1.5=78^1.5,
x=52;
(14)20%x-2.4x3=0・8,
20%x-7.2=0.8>
20%x-7・2+7・2=0.8+7・2,
20%x^2O%^20%,
x=40;
x=252
(76)0.6x+3x2.5^67.5,
0.6x+7.5-67.5»
0.6x+7.57.5=67.57.5,
0.6x=60>
0.6x^0.6=60^0.6,
x^100;
3x472,
4
3xt3=9t3,
x=3
(20)^x+0.8^5.6>
35
*080.8=5.6
5
0.8,
—x=4.8,
5
-xx-§=4.8x^,
533
x=8•
(21)1.4:
x=1:
0.75,x=1.4^0.75>x=1.05
(22)xx(2-|)=24,
xx£=24,xx耳益令空,
555
x=20;
■
4X
■
4X
3-4
3+4
3143-4
34也4
(77)
3
045)=5
含(x-0.45)x(x-O45)^(x-
1&O45)>x-2.4=1.6>
4x=4,
4x*4=4m4,
x-1
(24)12x^7x0.3=20.1»
72x+2・1=20.1,
72x+2.7-2.1=20.12.1
12x^12=18^12,
x=L5;
¥x-去4+2.4=7.6+2.4,
(25)
l26'x:
42=T1°'
(18)x-
2.25=8.25>
x-2.25+2.25=8.25+2.25,
70x=42xg,
7
10x^10=30^10,
x=3
x=10.5;
0・75+〕x0.75UW75
2
0.75.
(28)0・8-卜0.48-x・
12
0・8x"-^xo・48*
12
P8X&.2・
98x-l-0・8"0・2«l-0・8"
E)2(X3)=5.8•2(X,3)十2U5CO+2
XI3"29
X—3+3"2・9+3・
益5・9-
(34二.6XU6.4-
7・6xt・6u6・4i・6・
x"4八
(35)4X,3X9U29.
4X,27U29-
4X‘27+27U29+27-4XU56"4x小4"56十4-
XH74-(36)76+8XU4776+8X,76U4O16-
8XU24.
8xm8=24«l«8-
XU3-(37)xt・7"3-
55
0卜卜rN
5・5E・E
〔37)5X,0・4"75%.
5x0.4+0-4=752+0.4"
5X*5"・15*5》
x"0・23
Q2J6x0・9=4・5・
6xp9+0・9H45+a9・
6X"5・4-
6X*6=5・4小6-
XH0・9-
Xi・7x7・u3x7・7.
XUH3
2XHA・
4
2x9.'r2・
4
2・167X±.04」
2767x1.04"104
7・727XM0・
(40)mxj
7x*l-7u7・72-b7■
XH0・76-
IH-X—TH2+7-
6
■lx亠J,
666
x=18;
(47)x—x=14/
9
产74”—x十丄=74十丄»
999
x=18;
(42)3x-玄壬,
419
(47)x4--=-+)»
46
X一玄鼻11x3
2壬,
419
4•4辽
x=A;
19
(43)—CL26,
(48)
125%X+25%x=3+25%x,
4
0.25x^0.25-0.25=1-
0.25,
0.25x^0.75,
x=3;
L25,X,
0.251.^
(49)
O.25x=1.25^1.6»
0.25x^0.25=1.25x1.6x0.25‘
722.4
2・4x=72x0.26,2.4x=18.72,
2.4xt2.4=/8.72W2.4
x=7.8;
(44)1.2:
ZM,
35
x=8»
(50)
討2x5,
—6亠
333
x=9;
(45)些=2:
2,
X1015丄x“8x寻,%¥,
x=12;
(46)佥卡x:
0.8‘曲“・8,
x=0.2;
(51)5:
8=x:
32,8x=5x32,
8x08=5x32*8»
x=2O
(52)2x+3x0.9=24・9,
2x+2.7=24.9,
2x+2.72.7=2492.7,
2xt2=22.2t2,
x=11.1;
(53)5.3x2.9x=¥,
5
2・4x骨
2*2.4誉・4,
(54)爭(7-
2.8x)=1.5,
辛(7-2.8x)
7-2.8x=2•厂
72.8x+2.8x=2J+2.8x,
7-2J=2J+2.8x2.1
4.9t2.8=2.8xr2.8,x=1.75;
2X=3X8
MM
3415
XW.05x0.05=3.528^0.05,
X=0.1764;
(63)2X-
4x6=80,2X24=80,2X-24+24=80+24,
2X=104,2X^2=104^2,
X=52;
(64)4x4.5-3*6.38,
183X=6.38,
183X+3X=6・38+3X,
6.38^3X=18,
6.38+3X6.38=186.38,3X=11.62,
3X^3=11.62^3,
y_581.
x~Iso'
(65)4X7.2=10>
4X
7.2+7.2=10+7.2,
4X=17.2,
4X24=17・2詔,
X=4.3;
(66)11.5X^X=20,
12.5X=20,
12.5X^12.5=20^12.5‘
X=1.6;
(67)3.8x12+15X^87.6,
45.6+15X=87.6,
45.6+75X-45.6=87.645.6,
15X=42,
15X^15=42^15,
X=2.8
(68)6X+5=17,
6x+55=175»
6xt6=/2t6‘
(69)0.6x(2.5+X)=4.2,
0・6x(2.5+X)t0.6=4.2t0.6,
2.5+x=7>
2.5+x-2.5=72.5,
x=4.5;
3•2_y•8
—・^—A・—
4315
2-3
x=1To
2一5
2-4
X
X1027
(76)x-眾,
—乂—
5yMyC
6X^"5r
X
1027
X
72
1027
(77)200:
6=x:
迄
5
6x=200x辛,
5
6x^6=480^6♦
x=80
(78),
5
4tXxX=|X
Zx=4,
x=ro;
4一5
X
4-5
X
4-5
(74)4(g+x)悄,
—+4x=—,
5-
—+4x
5
5
16.36
~~
妙
5
4x=4,
X=1;
(75)±0・25+2x=F,
524
0.2+lx=^>
24
0.2+^x-0.2=^-
24
0.2>
11
20
(79)8(x-2)=2(x+7),
8X76=2X+74,
6X16=14>
6X=3O,
X=5;
(80):
78%=竽,
-^X^0.18x6.5,
总XT.17,
20
X=7.8
4
r(81)f二…2
2吨,
2x+2x4+2x,
l=i-1
252
18x-3=64,
18x3+3=64+3,
18x=67,
18x^18=67^18,
x=—;
20
—x+—x=46*
54
(82)
x(詐)=46,
x=40;
x=—;
20
(84:
'.1二§-"6:
上,
2x
L6x=6.4x2,
1.6x=12.8,
1.6x^1.6=12.8^1.6,
x=8
(87)8(2X7)=5(X+73),16x-56=5x+65,
16x565x=5x+655x,11x-56=65>
11x-56+56=65+56>
11x=121,
11x^11=121^11»
x=77,
(88)3(x+4.5)=60,
3(x+4・5)t3=60t3,
x+4.5=20,
x+4・54.5=20
4.5,
x=15.5
(89)1.6x+2.4=7.52,
7.6x+2.42.4=7.522.4,
1.6x=5.12»
1.6xx1.6=5.12^1.6,
x=3.2;
(90)3(x-0.8)=6.3,
3x-2.4=63,
3x2.4+2.4=6.3+2.4,
3x=8.7,
3xw3二&723,
x=2.9;
(85)5(3x-4)-2(x-1)=5(2x-
1)
15x202x+2=10x5,13x18=10x-5,
13x1810x=10x-5
10x,
3x18=5,
3x-18+18=-5+78,
3x=13»
3xt3=)3t3,
(97)2845x=5.8>
28.45x+5x=5.8+5x*
5.8十5x=2&4,
5.8+5x-5.8=28.45.8,
5x=22.6,
5xv5=22.6t5,
x=4.52
(92)
x:
i
25x=x3,
83
3(6x7)=64,
1
6
25x「,
2
25x4-25=^4-25,
乙
2x=0,x=0;
J34
X_4*
(100)
-+-x-
翼,
55
(94)舟三x“5%,
20
3■xxx=75%x,
*20~0.15x=0.15、
0.15x^0.15=0.15x0.15,
X=1;
Xx-§=-?
x-§,
252
X=1;
(101)XX(屛)=
22,11."1?
痰
15
(95)|x-
%?
515
(22)
X^=22x15,
19
■
104)x
y=1-—-,
Fit
厶丄
1515
厶厶丄4亠丄,
15•15IE•IE
x=
(96)x+50%x=6,
1.5x=6»/.5xt/.5=6t/.5,x=4;
(97)总:
x=0.3:
12>
4
0.3x=-|xi2,
0.3x^0.3=9r0.3,
x=3O;
(98)4x+2(8-x)
=26,
4x+762x=26»2x+/6=26,2x+1616=26
16,
2xt2=10^2,
x=5
(99)-ix-邑0,
34
丄444
3x=,
丄3
34
3x+3x二斗+3乂'
-i_ii-i,
2"42
3x^3弋一3,
x=—;
4
三尸28'
755
吕片28X-*
5TT
x=2O;
2二1丄,
714
X亠丄
1003
(106)5x+35=650,
5x+3535=65&
35>
5x=6/5,
5xt5=6/5t5,
x=123;
(107)720^3x=80,
720t3xx3x=80x3x,
240x=720,
240x^240=720^240,
x=3;
(108)3.6x
0.9x=8.1»
(3.6-0.9)x=8.1>
2.7x^8.1>
2.7xt2.7=8Jt2.7^
(109)4x4.53x=6,
183x=6,
7&3x+3x=6+3x,
6+3x=18,
6+3x6=18-6,
3x=12,
3x^3=12^3,
x=4
(110)JQ-ZQ,
x0.8
2.5x=10x0.8,
2.5xt2.5=8t2.5,
x=3.2;
(111)6x3-
1.8X=7.2,
781.8X=7.2,
18
1.8X+1.8X-7.2+1.8X,
7.2+1.8X=18,
7.2+tSX7.2=187.2,
1.8X=10.8,
1.8Xt1.8=10.8t1.8,
X=6
(113)xm丄42,
14
x=42x-^->
14
x=9;
(114)
3
85
=里,
52^
if
20
1,5
5公
0.6x=6,
0.6xt0.6=6t0.6、
x=1O;
(117)3(x+2)=4(x+7),
3x+6=4x+4,
3x+6・3x=4x+43x,
x+4=6,
x+44=6-4,
x=2
(118)3x70%x=9.2,
3x-0.7x=9.2,2.3x=9.2,2.3xt2.3=9.2t2.3‘
x=4
5.3二
嘗
8
x=
6
亏
(119)