256-124-78,用简便算法怎么算?
1个回答
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解:256-124-78等于( 54 )
∵已知需求出256-124-78等于多少
∴256 - 124 - 78
= (200 + 56)- (100 + 24)- (100 - 22)
= 200 + 56 - 100 - 24 - 100 + 22
= (200 - 100 - 100)+(56 - 24 + 22)
= (100 - 100)+(32 + 22)
= 0 + 54
= 54
答:256-124-78等于54
∵已知需求出256-124-78等于多少
∴256 - 124 - 78
= (200 + 56)- (100 + 24)- (100 - 22)
= 200 + 56 - 100 - 24 - 100 + 22
= (200 - 100 - 100)+(56 - 24 + 22)
= (100 - 100)+(32 + 22)
= 0 + 54
= 54
答:256-124-78等于54
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