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99x56用简便方法计算

=(100-1)*56 =100*56-1*56 =5600-56 =5544

99x56 十56 =56x(99+1) =56x100 =5600 祝天天向上。

99×56+56 =56×(99+1) =56×100 =5600

99/33=3 36/12=3 56/7=8 综上,结果为72

23/56×57 =23/56×56+23/56×1 =23+23/56 =23又56分之23 100×98/99 =1×98/99+99×98/99 =98/99+98 =98又99分之98 4/5×2/9+4/5×7/9-4/5 =4/5×(2/9+7/9-1) =4/5×0 =0 你好,本题已解答,如果满意 请点右下角“采纳答案”。

78x1.7-78x0.7 =78x(1.7-0.7) =78 99x0.56 =100x0.56-1x0.56 =56-0.56 =55.44 99x0.81+0.81 =0.81x(99+1) =0.81x100 =81

99x56+56 =(99+1)x56 =100x56 =5600

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