1、30 7802069075050840 52023 70444 48032672 7545889739 62457618173 1173691 1361552315 57 3621535126 2351232119163322156 16525631306 260 30346652241674845 78050520 920 84070444 4802175462426 9.990.0284035630961191 98028 828234 613 320257210+2865 44476 4321 350 930 864694598126 60987 9100240507039 793645
2、028932000700510883127210 13898240312689203312336858918278883764543728117 9165 13615 5715829444加法交换结合律:4825175 57814322571288972 3572881431292351711653785277316728933583942617534125366125753201533816216332137268158395105822197788.商不变的规律:3004000240600320040015080020009000125混合运算6726727 987(345298) 210
3、520(240227)3402402030(320170)90458(8528)23630840(240212) 408512(178283)864(2723)12(10512635)24014053360260104482721635655202401802 3020146(3442070)(2714)4(77217)691(165655)5 (120195)15557(18626)375(2510)(65934)+(28040)1527-2008(324-285)26 (1604812)4(3629)662(3001455)50 (3654984)90(6752)18236(126) 64
4、0(96-80)1256084864012 2800100789(947599)7664(91327623)(932521) 5071363498723(521504)3841223371(3921)(3966)156(17.7-7.2)337.85-(7.85+6.4) 28(5+969.9318)81(72-54)9 (15003245) 192(5438)6713825(13125)(38)(12+24+80)70432(25+125) 1781011788436+64847599+27583102832 98199 123181233+8512350(344)(24+16)99+178
5、7942+79+79577300258100427+19870+13310 4(2565+2528)102589828084085(95144024) 58870(105202)80400(430087015)14372727563 814325278) (331) 37.4(8.67.246.6)107-772937.85-(7.85+6.4)2875+96990318 1554(72-58)(126)5288(2614)85006-(502-80)6412 (453816) 500(240386)64(8742)(845153)(4928)7(8448)58+37)(64-9178-145
6、6+42口算题38019=40100=202020=75-755=40+36090=8=7720 100-136=66060=7030=3420=50=350+80=40=2845= 300523=42021=460280 145+8=45-27=12+1212=09=6-70 280+70=81027 45059= 60 1000760100 1225 623 065+5 6+18+8498+124215996090=34=432=11600=75-18= 70-30= 8000-3000=120900= 9003= 3204=4 84431.4 13100 120685584.31000=
7、2.50.0545201002.898891= 10(2.3+2.7)997=0.5+1.5=62=(3625)=0.750.3= 0.5+0.5= 0.5-0.5=3008416=0.691.1=18= 7724030 1.30.8=60.37=0100+100=0= 2.730.27=540270 40050=9933= 18470+70=14140070=6120=480620-30=217-65-35=30-306+8=计算下面各题,能简便的要简算49102249788.332.434.5799376.7-2.633.3-3.37 41000(415) 3.572+6.55824(85
8、78)2870 6.450.581.42 3.276.42.734.612000825 (160+880)(324285)36 996464715+265+335+285462017100-137-263+3002 3434666 74(16726)37-56+73-44 45108 248302675 5522785546-346=78999998101101999+49 4545264573383636874(2423506)(159)(15530)2599(696456)48(3959433)(40+4)25= 12543574357=524576203=289104= 9610196=
9、486(18659)41=863297= 216305=32=4723664=402359=4378122257=(264)=44= 354(22946)=简便计算分类练习题第一种(300+6)x1225x(4+8)125x(35+8)50 32(25+125)(24+16) (13+24)x8第二种 84x101504x2578x10225x204 88 10210187第三种99x64 99x16638x99999x99 98x27x34第四种99X13+1325+199X2532X16+14X3299+178 84231078X4+78X3+78X3第五种88X12572X125125X
10、32X825X32X125第六种3600300012512503900(3925)(57)(20第七种1200-624-762100-728-772273-73-27847-527-273500124710212322356(1356721)1235(17801665)30657381065235718331735723651086214第八种278+463+22+37732+580+268425+14+186158+262+1381034+780320+102375+219+381+2252214+638+286181+2564)+2719378+44+114+242+222276+228+
11、353+219(375+1034)+(966+125)(2130+783+270)+101799+999+9999+99999第九种214-(86+14) 787-(87-29)365-(65+118)455-(155+230)第十种576-285+85825-657+57690-177+77755-287+87第十一种871-299157-99363-199968-5991883398497299899+3443999+4982370+1995157+99第十二种178X101-17883X102-83X217X23-23X735X127-35X16-11X3512318123容易出错类型(
12、共五种类型)600-6020X420X4736-35X2025X425X498-18X5+2556X856X8 280-8012X612X6175-7525X825X880-20X2+6036X936X9 36-366-6(25X8)100+45-100+45 15X97+3 100+1-100+148X99+11000+8-1000+85+95X28102+1-102+165+35X1325+75-25+7520-1013+24X8672-36+64324-68+32100-36+64简便计算综合练习题126396135695655551017876477676134561344513424
13、4823(404) 999999199918498 695202 864199738301 380476120(569468)(432131)2561475337312929189(8974)72简便计算练习题21642456(25636)(181+2564)+2719(375+1034)+(966+125) 99+999+9999+999997755(2187+755)7755(2187+755)简便计算练习题38)(25+125)12357简便计算练习题4124831504800215001680012030100210040049700 375+219+381+225 500124710
14、21232 378+44+114+242+222(375+1034)+(966+125) (2130+783+270)+1017 2214+638+286简便计算练习题576 589899+178 7300 810075 简便计算练习题6(ab)c=a(bc)2.730.891.274.370.281.635.72abc(bc)100.4322.5689.35.262.7414.9(5.24.9)18.325.474.32(ab)(bc)6.80.040.250.1256.41.2512.5(a+b)=cb0.452010.5810.150.24.79.9简便计算练习题73.285.76.722.10.12.30.184.260.181.37.32.73.750.52.75
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