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0.2×54+0.2×13+32÷5+0.2 简算
人气:284 ℃ 时间:2020-05-10 03:49:51
解答
0.2×54+0.2×13+32÷5+0.2
=1/5×54+1/5×13+32×1/5+1/5
=1/5×(54+13+32+1)
=1/5×100
=20
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