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77x99简便计算

=77*(99+1) =77*100 =7700

78×100-78

=10×28+28+77×100-77 =280+28+7700-77 =308+7623 =7931

77乘以99用简便方法怎么计算 =77×(100-1) =77×100-77 =7700-77 =7623

=(43+34)+77×99 =77+77×99 =77×(1+99) =77×100 =7700

原式 =(76+1)x99 =77x99 =77x(100-1) =77x100-77x1 =7700-77 =7623 供参考。

6.77x99+6.77 =6.77×(99+1) =6.77×100 =677

24200

an=11n×11(n+1)=11(n^2+n)就是5^2+6^2+…+8^2这有公式的还有5+6+7+8=26再乘11就可以了

4.7x9+4.7 =4.7×(9+1) =4.7×10 =47

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