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1、加法交换律和结合律练习题36+6436+64487-287-139-61500-257-34-14320003681321814-378-42289x99+89一、简便运算1361OI-13699I26I25I58181.1.125378396282243+189+572716+731662(I(X)+1)4425591+482+118473+79-73二、怎样倚便就怎样计算355+260+140+245IO2992x125645-180-245382101.-3824x60x50x8358+356-435I25322546IO15699x261022-478-422987-(287+135)
2、478-256-144216+89+11155+2M+36+44698-291-925(20+4)382+165+35-8288225+22512759-126-25958IOI236+189+6425794569-256-4487I2588599371.()27846+7854169-19+58I69I23-23I693799+3748+56I252532242529IO1-12914969-149+149325651+5649I2548514+189214369256+15673225414656254I252473+262416x98+32512(373212)228+(72+189)109+(291176)
