(8.4×2.5+9.7)÷(1.05÷1.5+8.4÷0.28)简便运算
人气:156 ℃ 时间:2020-04-02 15:16:09
解答
=(8.4×10÷4+9.7)÷(0.7+30)
=(84÷4+9.7)÷30.7
=30.7÷30.7
=1
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