141 整式的乘法 综合计算题含答案.docx
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141整式的乘法综合计算题含答案
整式的乘法计算80道(含答案)
14.1.1同底数幂的乘法
14.1.2幂的乘方
14.1.3积的乘方
14.1.4整式的乘法
(1)单项式乘单项式
(2)多项式乘以多项式(3)同底数幂的除法
【公式回顾】
1.同底数幂的乘法:
(
为正整数);同底数幂相乘,底数不变,指数相加.
2.幂的乘方:
(
为正整数);幂的乘方,底数不变,指数相乘.
3.积的乘方:
(
为正整数);积的乘方,等于各因数乘方的积.
4.同底数幂的除法:
(
≠0,
为正整数,并且
).
同底数幂相除,底数不变,指数相减.
5.单项式乘以单项式:
单项式与单项式相乘,把他们的系数,相同字母分别相乘,对于只在一个单项式里含有的字母,则连同它的指数作为积的一个因式.
6.单项式乘以多项式:
单项式与多项式相乘,就是用单项式去乘多项式的每一项,再把所得的积相加.即
(
都是单项式).
7.多项式乘以多项式:
多项式与多项式相乘,先用一个多项式的每一项乘另一个多项式的每一项,再把所得的积相加.即
.
8.单项式相除:
把系数、相同字母的幂分别相除作为商的因式,对于只在被除式里出现的字母,则连同它的指数一起作为商的一个因式.
9.多项式除以单项式:
先把这个多项式的每一项分别除以单项式,再把所得的商相加.
即:
计算练习:
(1)y4•y3•y2•y;
(2)(﹣x2y3)4;(3)82019×(﹣0.125)2019;
(4)(a3)2•(2ab2)3.(5)(﹣
x3y2)3(6)5a2•(﹣3a3)2
(7)(﹣2anb3n)2+(a2b6)n;(8)(m﹣n)2•(n﹣m)3•(n﹣m)4(9)2100×4100×0.12599.
(10)a3•a4•a+(a2)4+(﹣2a4)2.(11)(2x2)3+x4•x2+(﹣2x2)3(12)x•x3+x2•x2.
(13)(﹣3x3)2﹣(﹣x2)3+(﹣2x)2﹣(﹣x)3.(14)(b2n)3(b3)4n÷(b5)n+1
(15)(a2)3﹣a3•a3+(2a3)2;(16)(﹣4am+1)3÷[2(2am)2•a].
(17)8a(a2+
a+
);(18)5x2y•(﹣2xy2)3.(19)7x4•x5•(﹣x)7+5(x4)4.
(20)(
﹣1)0+(﹣1)2020;(21)(10a2﹣5a)÷(5a).(22)(14a3﹣7a2)÷(7a);
(23)(a+b)(a2﹣ab+b2)(24)3x2y•(﹣2x3y2)2;(25)(﹣2a2)•(3ab2﹣5ab3).
(26)a5•a3÷a2;(27)(﹣2m)3﹣(m3)2;(28)(﹣2a2b)•(
abc);
(29)(﹣2x)3(2x3﹣
x﹣1)﹣2x(2x3+4x2)(30)(x+3)(x﹣7)﹣x(x﹣1).
(31)2xy2•(﹣3xy4)(32)(
y3﹣3y2+
y)÷
y(33)(﹣2y3)2+(﹣4y2)3﹣(﹣2y)2•(﹣3y2)2
(34)an﹣5(an+1b3m﹣2)2+(an﹣1bm﹣2)3(﹣b3m+2)(35)(﹣2xy2)6+(﹣3x2y4)3;
(36)﹣x2•(﹣x)3+3x3(﹣x)2﹣4(﹣x)•(﹣x4).(37)﹣b2×(﹣b)2×(﹣b3)
(38)(x﹣y)3×(y﹣2)2×(y﹣2)5(39)﹣a4•a3•a+(a2)4﹣(﹣2a4)2
(40)(a2b2)3÷(﹣ab3)2(41)5x2•x4﹣(﹣2x3)2+x8÷x2(42)
(43)(x﹣1)(2x+1)﹣2(x﹣5)(x+2)(44)3x3y3•(﹣
x2y2)+(﹣
x2y)3•9xy2.
(45)(3a2b)2•(a2)4•(﹣b2)5.(46)[2(a﹣b)3]2+[(a﹣b)2]3﹣[﹣(a﹣b)2]
(47)x2y3(﹣2xy3)2(48)(3m2+15m3n﹣m4)÷(﹣3m2)(49)(2x3y4﹣3x3y2z)÷x2y2
(50)(x﹣y)(x2+xy+y2).(51)[(x2)3]2﹣3(x2•x3•x)2;(52)3a•(a2+2a)﹣2a2(a﹣3)
(53)(x2y3)2+(﹣xy)3•xy3(54)
(55)x•(﹣x)•(﹣x)4(56)y•x5+(﹣2x2)2+(﹣2x2)3(57)y4+(y2)4÷y4﹣(﹣y2)2
(58)(x﹣y)2•(y﹣x)7•[﹣(x﹣y)3](59)(2×102)4(60)x•x2•x3+(x2)3﹣2(x3)2;
(61)(﹣a2)3﹣3a2•a•a3(62)(x﹣y)9÷(y﹣x)6÷(x﹣y)
(63)﹣2x6﹣(
x)2•8x5+(2x4)3÷(﹣x)5(64)(﹣2x3y)2•(﹣2x)(65)(﹣4)2012×(0.25)2013
(66)若3m=6,9n=2,求3m﹣4n+1的值.(67)(x﹣3y)(﹣6x);
(68)(6x4﹣8x2y)÷(﹣2x2).(69)(﹣1+3x)(﹣3x﹣1);(70)(x+1)2﹣(1﹣3x)(1+3x).
(71)已知(ax)y=a6,(ax)2÷ay=a3
(1)求xy和2x﹣y的值;
(2)求4x2+y2的值.
(72)15mn2÷5mn×m3n;(73)(3x+1)(2x﹣5).(74)
(75)(
x3y)•(﹣3xy2)3•(
x)2.(76)(x﹣2y)(x+2y﹣1)+4y2(77)(a2b)[(ab2)2+(2ab)3+3a2].
(78)(a3b4)2÷(ab2)3;(79)(﹣2x3y2﹣3x2y2+2xy)÷2xy.(80)(﹣2a2)3+2a2•a4;
(81)(﹣2×105)2÷(8×105)
整式的乘法计算80道参考答案与试题解析
(1)原式=y10;
(2)原式=x8y12;
(3)原式=(﹣0.125×8)2019=﹣1;
(4)原式=a6×8a3b6=8a9b6.
(5)(﹣
x3y2)3=﹣
x9y6;
(6)原式=5a2•9a6=45a8;
(7)原式=4a2nb6n+a2nb6n=5a2nb6n;
(8)(m﹣n)2•(n﹣m)3•(n﹣m)4=(n﹣m)2+3+4,=(n﹣m)9;
(9)原式=299×2×499×4×0.12599=(2×4×0.125)99×2×4=199×2×4=1×2×4=8.
(10)a3•a4•a+(a2)4+(﹣2a4)2=a8+a8+4a8=6a8.
(11)原式=8x6+x6﹣8x6=x6;
(12)原式=x4+x4=2x4;
(13)原式=9x6﹣(﹣x6)+4x2﹣(﹣x3)=9x6+x6+4x2+x3=10x6+x3+4x2.
(14)(b2n)3(b3)4n÷(b5)n+1=b6n•b12n÷b5n+5=b6n+12n﹣5n﹣5=b13n﹣5;
(15)(a2)3﹣a3•a3+(2a3)2=a6﹣a6+4a6=4a6;
(16)(﹣4am+1)3÷[2(2am)2•a]=﹣64a3m+3÷8a2m+1=﹣8am+2
(17)8a(a2+
a+
)=8a•a2+8a•
a+8a•
=8a3+6a2+5a;
(18)原式=5x2y•(﹣8x3y6)=﹣40x5y7;
(19)原式=7x4•x5•(﹣x7)+5x16=﹣7x16+5x16=﹣2x16.
(20)(
﹣1)0+(﹣1)2020=1+1=2;
(21)(10a2﹣5a)÷(5a)=2a﹣1.
(22)(14a3﹣7a2)÷(7a)=14a3÷7a﹣7a2÷7a=2a2﹣a;
(23)(a+b)(a2﹣ab+b2)=a3﹣a2b+ab2+ba2﹣ab2+b3=a3+b3.
(24)3x2y•(﹣2x3y2)2=3x2y•4x6y4=12x8y5;
(25)(﹣2a2)•(3ab2﹣5ab3)=(﹣2a2)•(3ab2)﹣(﹣2a2)•(5ab3)=﹣6a3b2+10a3b3.
(26)a5•a3÷a2=a5+3﹣2=a6;
(27)(﹣2m)3﹣(m3)2=﹣8m3﹣m6;
(28)(﹣2a2b)•(
abc)=﹣
a3b2c.
(29)原式=
=﹣16x6+4x4+8x3﹣4x4﹣8x3=﹣16x6;
(30)原式=x2﹣7x+3x﹣21﹣x2+x=﹣3x﹣21.
(31)原式=﹣6x2y6;
(32)原式=
y2﹣
y+1;
(33)(﹣2y3)2+(﹣4y2)3﹣(﹣2y)2•(﹣3y2)2=4y6﹣64y6﹣4y2•(9y4)=4y6﹣64y6﹣36y6=﹣96y6.
(34)原式=an﹣5(a2n+2b6m﹣4)+a3n﹣3b3m﹣6(﹣b3m+2),=a3n﹣3b6m﹣4+a3n﹣3(﹣b6m﹣4),=a3n﹣3b6m﹣4﹣a3n﹣3b6m﹣4,=0.
(35)(﹣2xy2)6+(﹣3x2y4)3=64x6y12﹣27x6y12=37x6y12;
(36)﹣x2•(﹣x)3+3x3(﹣x)2﹣4(﹣x)•(﹣x4)=x5+3x5﹣4x5=0.
(37)﹣b2×(﹣b)2×(﹣b3)=b2×b2×b3=b7;
(38)(x﹣y)3×(y﹣2)2×(y﹣2)5=(x﹣y)3(y﹣2)7.
(39)原式=﹣a8+a8﹣4a8,=﹣4a8;
(40)原式=a6b6÷a2b6=a4.
(41)原式=5x6﹣4x6+x6=2x6
(42)
=
=﹣4x5y3+9x4y2﹣2x2y;
(43)(x﹣1)(2x+1)﹣2(x﹣5)(x+2)=2x2+x﹣2x﹣1﹣2(x2+2x﹣5x﹣10)=2x2﹣x﹣1﹣2x2+6x+20
=5x+19.
(44)原式=3x3y3•(﹣
x2y2)+(﹣
x6y3)•9xy2=﹣2x5y5﹣
x7y5.
(45)原式=9a4b2•a8•(﹣b10)=﹣9a4b2•a8•b10=﹣9a12b12.
(46)原式=4(a﹣b)6+(a﹣b)6+(a﹣b)2=5(a﹣b)6+(a﹣b)2.
(47)x2y3(﹣2xy3)2=x2y3•(4x2y6)=4x4y9;
(48)(3m2+15m3n﹣m4)÷(﹣3m2)=﹣1﹣5mn+
m2.
(49)(2x3y4﹣3x3y2z)÷x2y2=2xy2﹣3xz;
(50)(x﹣y)(x2+xy+y2)=x3+x2y+xy2﹣x2y﹣xy2﹣y3=x3﹣y3.
(51)原式=(x6)2﹣3(x6)2=x12﹣3x12=﹣2x12;
(52)原式=3a3+6a2﹣2a3+6a2=a3+12a2.
(53)(x2y3)2+(﹣xy)3•xy3=x4y6﹣x4y6=0;
(54)
=(﹣0.25)15×415+
×
×
=(﹣0.25×4)15+
×
=﹣1+(﹣1)×
=﹣1﹣
=
.
(55)原式=﹣x2•x4=﹣x6;
(56)原式=x5y+4x4﹣8x6.
(57)y4+(y2)4÷y4﹣(﹣y2)2=y4+y8÷y4﹣y4=y4+y4﹣y4=y4;
(58)(x﹣y)2•(y﹣x)7•[﹣(x﹣y)3]=(y﹣x)2•(y﹣x)7•(y﹣x)3=(y﹣x)12.
(59)(2×102)4=1.6×109;
(60)原式=x6+x6﹣2x6=0;
(61)(﹣a2)3﹣3a2•a•a3=﹣a6﹣3a6=﹣4a6.
(62)原式=(x﹣y)9÷(x﹣y)6÷(x﹣y)=(x﹣y)2=x2﹣2xy+y2;
(63)原式=﹣2x6﹣
•8x5+(8x12)÷(﹣x5)=﹣2x6﹣2x7﹣8x7=﹣2x6﹣10x7.
(64)(﹣2x3y)2•(﹣2x)=(4x6y2)•(﹣2x)=﹣8x7y2
(65)(﹣4)2012×(0.25)2013=(﹣4)2012×(0.25)2012×(0.25)=(﹣4×0.25)2012×0.25
=(﹣1)2012×0.25=1×0.25=0.25
(66)9n=(32)n=32n=2∴3m﹣4n+1=3m÷34n×3=3m÷(32n)2×3=6÷4×3=
(67)原式=﹣6x2+18xy;
(68)原式=﹣3x2+4y.
(69)原式=(﹣1)2﹣(3x)2=1﹣9x2;
(70)原式=x2+2x+1﹣(1﹣9x2)=x2+2x+1﹣1+9x2=10x2+2x.
(71)
(1)∵(ax)y=a6,(ax)2÷ay=a3∴axy=a6,a2x÷ay=a2x﹣y=a3,∴xy=6,2x﹣y=3.
(2)4x2+y2=(2x﹣y)2+4xy=32+4×6=9+24=33.
(72)15mn2÷5mn×m3n=3n×m3n=3m3n2;
(73)(3x+1)(2x﹣5)=6x2﹣15x+2x﹣5=6x2﹣13x﹣5.
(74)(﹣
x2y﹣
xy2)•(﹣
xy)2=(﹣
x2y﹣
xy2)•
x2y2=﹣
x4y3﹣
x3y4.
(75)原式=
x3y•(﹣27x3y6)•
x2=﹣
x8y7.
(76)原式=(x﹣2y)(x+2y)﹣x+2y+4y2=x2﹣4y2﹣x+2y+4y2=x2﹣x+2y;
(77)原式=a2b(a2b4+8a3b3+3a2)=a4b5+8a5b4+3a4b.
(78)(a3b4)2÷(ab2)3=a6b8÷a3b6=a3b2;
(79)(﹣2x3y2﹣3x2y2+2xy)÷2xy=﹣x2y﹣
xy+1.
(80)(﹣2a2)3+2a2•a4=(﹣2)3(a2)3+2a6=﹣8a6+2a6=﹣6a6;
(81)(﹣2×105)2÷(8×105)=4×1010÷(8×105)=40×109÷(8×105)=5×104.