如题所述
解:72-43等于( 29 )
∵已知需求出72-43等于多少
∴72 - 43
= (70 + 2)- (40 + 3)
= 70 + 2 - 40 - 3
= (70 - 40)+(2 - 3)
= 30 - 1
= 29
答:72-43等于29
∵已知需求出72-43等于多少
∴72 - 43
= (70 + 2)- (40 + 3)
= 70 + 2 - 40 - 3
= (70 - 40)+(2 - 3)
= 30 - 1
= 29
答:72-43等于29
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