简便运算的练习题

129＋235＋171＋165138＋293＋62＋107169＋78＋22129＋235＋171＋165138＋293＋62＋107169＋78＋22乘法交换律、结合律练习题乘法交换律：aXb=bXa乘法结合律：(aXb)Xc=aX(bXc)观察算式中数的特点，运用乘法交换律、结合律进行计算。38X25X442X125X8(25X125)X(8X4)49X4X538X125X8X3(125X25)X45X289X2125X12)X8125X(12X4)乘法交换律和结合律的变化练习125X64125X8844X25125X2425X2825X12加法交换律：a+b=b+a357＋288＋143加法交换律、结合律练习题加法结合律：(a+b)+c=a+(b+c)158＋395＋105167＋289＋334)75x165)125x25x326)25x5x64x125乘法分配律及反应用练习题乘法分配律：（a+b）Xc=aXc+bXc正用练习(80+4)X25(20+4)X25(125+17)X825X(40+4)15X(20+3)乘法分配律正用的变化练习：36x9925x4139x101125x88201X2484x101乘法分配律反用的练习：34X72+34X2835X37+65X3785X82+85X1825X97+25X376X25+25X2475X299+75乘法分配律反用的变化练习：38X29+3864X199+6435X68+68+68X64【经典例题一】计算25x125x4x8【思路导航】如果先把25与4相乘，可以得到100，同时把125与8相乘，可以得到1000再把100和1000相乘就可以了。运用了乘法交换律和结合律。25x125x4x8=(25x4)x(125x8)=100x1000=100000【练一练】(1)125x15x8x4(2)25x24(3)125x164)75x165)125x25x326)25x5x64x125经典例题二】计算：(1)125x34+125x66(2)43x11+43x36+43x52+43思路导航】利用乘法分配律来计算这两题1)125x34+125x66(2)43x11+43x36+43x52+43=125x(34+66)=43x(11+36+52+1)=125x100=43x100=12500=4300练一练1】计算下面各题：(1)125x64+125x36(2)64x45+64x71-64x16(3)21x73+26x21+21练一练2】(1)125x15x8x42)25x243)125x16练一练3】计算下面各题：⑴125x64+125x36(2)64x45+64x71-64x163)21x73+26x21+21375+219+381+2255001-247-1021-232简便计算练习题1观察算式的特点并计算。158+262+138(181+2564)+2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+10172214+638+2862365-1086-21412x2575x24138x25x4(13x125)x(3x8)(12+24+80)x50简便计算练习题2简便计算练习题PAGE\*MERGEFORMAT#观察算式的特点并计算。简便计算练习题PAGE\*MERGEFORMAT#观察算式的特点并计算。32x(25+125)观察算式的特点并计算。704x2525x32x12588x125102x7658x98178x101-17884x36+64x8475x99+2x7583x102-83x298x199123x18-123x3+85x12350x(34x4)x325x(24+16)178x99+17879x42+79+79x57638x9978X4+78X3+78X375x27+19x2513x870+13x31025x204(300+6)x1225x(4+8)125x(32+8)72X125504x2578x10299x6499x16999x9999X13+1325+199X2532X16+14X32125X32X825X32X12588X1251200-624-762100-728-772273-73-27278+463+22+37732+580+2681034+780+320+102178X101-17883X102-83X217X23-23X7847-527-273425+14+18635X127-35X16-11X35378+44+242+222276+228+353+219(375+1034)+(966+125)75X24138X25X4(13X125)X(3X8)(12+24+80)X50704X2525X32X125(12+24+80)X50704X2525X32X12588X125102X7658X9884X36+64X8475X99+2X7583X102－83X2123X18－123X3+85X12350X(34X4)X325X(24+16)178X99+17879X42+79+79X5712X2532X(25+125)98X199178X101-178简便计算练习题6观察算式的特点并计算。26X39+61X26356X9-56X999X55+5578X101—7852X76+47X76+76134X56—134+45X13478X101—7852X76+47X76+76134X56—134+45X13448X52X2—4X48380＋476＋120256—147—539X72X12525X（40+4）999X999+999569+468）+（432+131）704X2528X4X25125X32X2598X42（2130+783+270）+1017简便计算练习题7观察算式的特点并计算。102X35158+262+138375+219+381+2255001－247－1021－232181+2564)+2719378+44+114+242+222(375+1034)+(966+125)(2130+783+270)+10172214+638+2862357－183－3172365－1086－214158+262+138375+219+381+2255001－247－1021－232181+2564)+27192214+638+2862365－1086－21442x125x8x5简便计算练习题8观察算式的特点并计算。12X2575X24102X76138X25X4(13X125)X(3X8)(12+24+80)X5025X32X12532X(25+125)88X125178X101-17884X36+64X8475X99+2X7598X199123X18-123X3+85X12350X(34X4)X325X(24+16)178X99+17879X42+79+79X57第一类：加65+73+135357+288+143272+68+28129+235+171+16517+145+23+356+7+8+102+103+104第二类：减400-256-44517-53-47284-159-41258-42-16545-167-145478-47-178第三类：乘45x4x523x5x225x9x48x(125x13)(250x125)x(4x8)25x4x88x12588x12572x125125x64x25125x(40-4)76x103第四类：乘(12+50)x4039x8+6x39-39x446+46x5928x225-2x225-6x22539x8+6x39-39x446+46x5928x225-2x225-6x22518x12525x4499x22+33x3442x2599x999x78第五类：乘45x37+37x5528x21+28x7917x23-23x738x46+64x3899x32+32167x2+167x3+167x5