6.4×2.5+3.6×7.5有简便方法吗?
3个回答
展开全部
6.4×2.5+3.6×7.5
=6.4x2.5+3.6x(5+2.5)
=6.4x2.5+3.6x5+3.6x2.5
=2.5x(6.4+3.6)+18
=25+18
=43
请采纳!
=6.4x2.5+3.6x(5+2.5)
=6.4x2.5+3.6x5+3.6x2.5
=2.5x(6.4+3.6)+18
=25+18
=43
请采纳!
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展开全部
6.4*2.5+3.6*7.5
=6.4*2.5+3.6*(10-2.5)
=(6.4-3.6)*2.5+3.6*10
=2.8*2.5+36
=43
=6.4*2.5+3.6*(10-2.5)
=(6.4-3.6)*2.5+3.6*10
=2.8*2.5+36
=43
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