1/7×198+2/7×81+3/7×20
=1/7×(198+2×81+3×20)
=1/7×(198+162+60)
=1/7×420
=60
7分之1乘198十7分之2乘81十7分之3乘20的算式
7分之1乘198十7分之2乘81十7分之3乘20的算式
数学人气：219 ℃时间：2019-12-11 17:53:48
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