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用乘法分配律简算:7.5×7.7+25×0.69
人气:309 ℃ 时间:2020-03-28 06:29:16
解答
7.5×7.7+25×0.69
=25×0.4×7.5+25×0.69
=25×3.08+25×0.69
=25×(3.08+0.69)
=94.25
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