7.4*5.6+2.6*4.6-7.4怎么巧算? 5
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7.4*5.6+2.6*4.6-7.4怎么巧算?
=7.4×(5.6-1)+2.6×4.6
=7.4×4.6+2.6×4.6
=4.6×(7.4+2.6)
=4.6×10
=46
望采纳 谢谢~~
=7.4×(5.6-1)+2.6×4.6
=7.4×4.6+2.6×4.6
=4.6×(7.4+2.6)
=4.6×10
=46
望采纳 谢谢~~
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解:7.4×5.6+2.6×4.6-7.4
=7.4×5.6-7.4+2.6×4.6
=7.4×(5.6-1)+2.6×4.6
=7.4×4.6+2.6×4.6
=(7.4+2.6)×4.6
=10×4.6
=46
这道题的简便运算关键在于,两次使用乘法分配律。
=7.4×5.6-7.4+2.6×4.6
=7.4×(5.6-1)+2.6×4.6
=7.4×4.6+2.6×4.6
=(7.4+2.6)×4.6
=10×4.6
=46
这道题的简便运算关键在于,两次使用乘法分配律。
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 7.4×5.6+2.6×4.6-7.4
=7.4×(5.6-1)+2.6×4.6
=7.4×4.6+2.6×4.6
=(7.4+2.6)×4.6
=10×4.6
=46
=7.4×(5.6-1)+2.6×4.6
=7.4×4.6+2.6×4.6
=(7.4+2.6)×4.6
=10×4.6
=46
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