6.3*101+7.8*99如何简便运算
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6.3*101+7.8*99如何简便运算
6.3*101+7.8*99
=6.3x101+(6.3+1.5)x99
=6.3x101+6.3x99+1.5x99
=6.3x(101+99)+1.5x(100-1)
=6.3x200+150-1.5
=1260+150-1.5
=1408.5
.
6.3*101+7.8*99如何简便运算
6.3*101+7.8*99
=6.3x101+(6.3+1.5)x99
=6.3x101+6.3x99+1.5x99
=6.3x(101+99)+1.5x(100-1)
=6.3x200+150-1.5
=1260+150-1.5
=1408.5
.