7.5*9.78+2.2*7.5的简便运算

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7.5*9.78+2.2*7.5的简便运算7.5*9.78+2.2*7.5的简便运算7.5*9.78+2.2*7.5的简便运算7.5*9.78+2.2*7.5=7.5*(9.78+2.2)=7.5*1

7.5*9.78+2.2*7.5的简便运算
7.5*9.78+2.2*7.5的简便运算

7.5*9.78+2.2*7.5的简便运算
7.5*9.78+2.2*7.5
=7.5*(9.78+2.2)
=7.5*11.98
=7.5*10+7.5*(2-0.02)
=75+15-0.15
=89.85

7.5*9.78+2.2*7.5 =7.5*11.98 =7.5*10+7.5*(2-0.02) =75+15-0.15 =89.85