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简便597- 197-69

你好,运用结合律进行简便计算原式=(597-197)-80 =400-80 =320希望可以帮到你.

342*16+342*85-342=342*(16+85-1)=342*100=34200

简便计算过程如下597-398=597-(400-2)=597-400+2=197+2=199望采纳

加法运算定律的简便运算题(一)1) 500+(407+0)= 2) 386+382+114= 3) 42+(91+158+109)= 4) (87+103+113)+97= 5) (246+387+154)+13= 6) 49+(71+151+129)= 7) 255+(79+45)= 8) (169+39+131)+261= 9) 219+175+181+225= 10) 14+498+

1) 500+(407+0)= 2) 386+382+114= 3) 42+(91+158+109)= 4) (87+103+113)+97= 5) (246+387+154)+13= 6) 49+(71+151+129)= 7) 255+(79+45)= 8) (169+39+131)+261= 9) 219+175+181+225= 10) 14+498+486= 11) (404+195+96)+305= 12)

254+399=254+400-1=653

希望能帮到你 300÷125÷8=300÷(125*8)=300÷1000=0.3 396-96-172-28 =(396-96)-(172+28)= 300-200 = 100 125*24 = 125*8*3 = 1000*3 = 3000 26*15 = (20+6)*15 = 20*15 + 6*15 = 300+90 =390 25*99*4 = 25*4*99 = 100*99 = 9900 250*32 = 250

解:597-349等于( 248 ) ∵已知需求出597-349等于多少 X - Y = Z ∴597 - 349 = (600 - 3)- (300 + 49) = 600 - 3 - 300 - 49 = (600 - 300)+(-3 - 49) = 300 - 52 = 248 答:597-349等于248

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