2.2×12.5+7.8×12.5 7.98×0.02×5 简便计算
1个回答
2.2×12.5+7.8×12.5
=12.5×(2.2+7.8)
=12.5×10
=125
7.98×0.02×5
=7.98×(0.02×5)
=7.98×0.1
=0.798
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