如题所述
解:91-29-43等于( 19 )
∵已知需求出91-29-43等于多少
∴91 - 29 - 43
= (90 + 1)- (30 - 1)-(40 + 3)
= 90 + 1 - 30 + 1 - 40 - 3
= (90 - 30 - 40)+(1 + 1 - 3)
= (60 - 40)+(2 - 3)
= 20 - 1
= 19
答:91-29-43等于19
∵已知需求出91-29-43等于多少
∴91 - 29 - 43
= (90 + 1)- (30 - 1)-(40 + 3)
= 90 + 1 - 30 + 1 - 40 - 3
= (90 - 30 - 40)+(1 + 1 - 3)
= (60 - 40)+(2 - 3)
= 20 - 1
= 19
答:91-29-43等于19
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