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77x99简便计算

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

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

=11x7x(4+99) =77x(3+100) =231+7700 =7931

根据乘法分配律

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

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

(29x0.48-4.77+29x0.52-5.23)x99的简便运算 =(29×(0.48+0.52)-(4.77+5.23))×99 =(29-10)×(100-1) =1900-19 =1881; 您好,答题不易 如有帮助请采纳,谢谢

11×11<5×6+6×7+7×8+8×9>=121×200=24200

78×100-78

77x99-77 =77x(100-1)-77 =77x100-77x1-77 =7700-154 =7546 不过,题目似乎有误,应该是:77x99+77 77x99+77 =77x(99+1) =77x100 =7700

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