人教版四年级数学下册简便运算专项练习.doc（20201205000154）第一种（例）25x（4+8）125x(8+8)(11+25)x8第二种（例）84x101504x2578x10225x204第三种（例）99x6499x16638x99999x9925+199X2532X16+14X3278X4+78X3+78X3第四种（例）99X13+13第五种（例）25X32X125125X32X888X12572X125第六种（例）3600+25W8100+4^753000+125+81250+25^5第七种1200-624-762100-728-772273-73-27847-527-273第八种278+463+22+37732+580+268425+14+186第九种214-(86+14)787-(87-29)365-(65+118)455-(155+230)第十种871-299157-99363-199968-599第^一种178X101-17883X102-83X217X23-23X735X127-35X16-11X35第十二种64+(8X2)1300+(13X5)480+(8X2)第十五种20X4+20X425X4+25X456X8+56X812X"12X6练习：169+354+231+146987-362-1381347-(347+125)135+236-135+236198X26148X56-48X56210+15199X37+37215X63-15X63101X22-22203X14125X33X4125X16X50365+997452-398简便运算习题1.加法交换律(a+b=b+a)如：152+389+348习题：77+56+23165+477+135154+288+462.加法结合律a+b+c=a+(b+c)如：591+482+118习题：285+147+25399+178+122456+588+412692+325+753.加法交换律、结合律650+(171+350)+129128+114+86+172如：32+29+68+41习题：(148+64)+(52+136)4.乘法交换律axb=bxa25X31X4125X27X840X69X255.乘法结合律：axbxc=ax(bx如：c)78X125X8125X32习题：52X25X4125X72125X8825X3225X44125X486.乘法父换律、结合律如：125X4X8X25习题：125X25X327.乘法分配律：ax(b+c)=axb+axc如：27X57+27X439.除法运算性质;ab~c=a-^bxc)=a-c-b习题：67X34+67X66127X43-27X4327X101-2727X10167X21+67X78+6767X23+67X78+67-6712X340+66X12025X44125X8885X10269X10278X9865+65X995X87+87+87X48.减法运算性质；如：781-178-122a-b-c=a-(b+c)=a-c-b721-488-121745-(245+188)456-273-127623-169-223553-(289+153)772-456+228689-(289-153)136-88+164-11227X99+2727X99如：720-H36-2怎样简便就怎样算。一、355+260+140+24598X10148X125645-180-24538X99+383500-14^5175X56+25X5650X25X20X40、368+156+344+132125X47X87200+25M44X2596X58+96X426300+(63X5)482-(182+50)135X27+135X72+135368+156+344+132125X47X87200+25W44X2596X58+96X426300+(63X5)482-(182+50)135X27+135X72+135四、789-136-64132X29+13298X83+1663700+4忌588X125048X125125X32X12536X88+36X15-108六、98+265+202273-73-27250X13X43200+4忌588X12599X38+3817X23-23乂772X125七、64X15-5X6425X(12X40)99X56+562182—1655—3453200^4^25298X99+298(40+8)>2597X8X