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1、加减法简便运算1、加法交换律和加法结合律综合运用(改变运算顺序，凑整先算)88+104+9624+42+76+5814+(425+186)67+25+33+75130+(70+4)29+22+7873+818+27+82+19325+68+3272+(56+28)31+67+19385+537+415248+309+291347+418+35375+168+25245+180+20+15560+255+40282+41+15913+46+55+54+87548+52+46825+75+25+7536+37+16498+265+202437+409+263862+45+55186+25+14+3
2、5+40111+38+89+50+4215+137+45+63+502、减法运算定律868-52-481500-28-272415-74-26528-53-47545-167-145487-187-139-61169-25-25-50672-36-64525-65-35528-89-128528-(150+128)273-27-73245-(67+45)2000-416-284980-290-390327-39-27907-(207+35)3865-1277-17235960-2578-1422415-74-263、其他1+2+3+4+98+99+1002+4+6+16+18+2020-19+
3、18-17+4-3+2-199+999+9999+999992002+2001-2000-1999+1998+1997-1996-1995+1994+1993-1992-19912补充：1、添括号、去括号327-258+58634-376+176725-(369-175)2353-(1675-747)737-(239-163)525+(175-58)738-(483-162)-217127+(73-59)250-(150-55)2、在计算没有括号的加、减混合运算时，第一个数的位置不变，其余的加数、减数可以带着运算符号“搬家”。468+75-168145-38+55143+68-433、672-
4、36+64375-201250-99199+2073699-(199-80)175-(75-38)467-356+156256-58+44127+198乘除法简便运算一、乘法交换律与乘法结合律综合运用1、改变运算顺序、凑整先算125(840)3552025(48)75125851741332253426452556425125482、分解因数(把因数分解成积的形式，再凑整计算)12251516253212588125351625442588125164250(34)25454991258721252532二、乘法分配律1、定律本身6464+3664265105-26559956+563828+
5、28+282575-15751672+1673+167528225-2225-6225398+639-39425(4+8)1723-2374572+45289938+3825(40+4)99256+25613512-1352358+356-435(12+35)28(125-11)2、分解因数(先把因数分解成和或差的形式，再用乘法分配律计算)1031220552420525204352019846999991991015102259923992645102121992598三、除法运算定律3305220001258420373200425420372700452300(253)4200(470)
6、3600(615)4、在计算没有括号的乘、除混合运算时，第一个数的位置不变，其余的因数、除数可以带着运算符号“搬家”。250242713945010290615402484642003581018360802“”At the end,Xiao Bian gives you a passage.Minand once said,people who learn tolearn are very happy people.In every wonderful life,learning is an eternal theme.Asa professional clerical and teachi
7、ng position,I understand the importance ofcontinuous learning,life is diligent,nothing can be gained,only continuous learningcan achieve better self.Only by constantly learning and mastering the latest relevantknowledge,can employees from all walks of life keep up with the pace of enterprisedevelopment and innovate to meet the needs of the market.This document is alsoedited by my studio professionals,there may be errors in the document,if there areerrors,please correct,thank you!