55乘66加66乘77加77乘88加88乘99的简便计算
人气:395 ℃ 时间:2019-09-29 04:27:43
解答
55×66+66×77+77×88+88×99
=11×5×11×6+11×6×11×7+11×7×11×8+11×8×11×9
=11×11×(5×6+6×7+7×8+8×9)
=121×200
=24200
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