6/7×3/14-1/5×3/7+2/3怎么简便运算?
1个回答
2020-07-15
展开全部
=3/7×3/7-1/5×3/7+2/3
=3/7×(3/7-1/5)+2/3
=3/7×8/35+2/3
=24/245+2/3
=72/735+490/735
=562/735
=3/7×(3/7-1/5)+2/3
=3/7×8/35+2/3
=24/245+2/3
=72/735+490/735
=562/735
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