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77x99简便计算

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

77x99 =77x(100-1) =77x100-77 =7700-77 =7623

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

78×100-78

77x100-77

55X66+66X77+77X88+88X99 =11×11×(5×6+6×7+7×8+8×9) =121×(30+42+56+72) =121×200 =24200

11*(5+6)+11*(6+7)+11*(7+8)+11*(8+9) 11*(5+6+6+7+7+8+8+9) 11*56=616

24200

55x66+66x77+77x88+88x99 =11×11×(5×6+6×7+7×8+8×9) =121×(200) =2420

7x9=63 77x99=7623 777x999=776 223 7777x9999=77 762 223 规律就是 所得的结果为“7...762....3”

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