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88.8x8.7 11.2x9.9.2x1.2巧算

88.8x8.7+11.2x9.9-11.2x1.2 =88.8x8.7+11.2x(9.9-1.2) =88.8x8.7+11.2x8.7 =(88.8+11.2)x8.7 =100x8.7 =870

88.8x8.7+11.2x(9.9-1.2) =88.8x8.7+11.2x8.7 =8.7x(88.8+11.2) =8.7x100 =870 请采纳,你的采纳是我上进的动力!可以追问,一直到懂!!

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