7/9-7/9×3/5+2/5,脱式计算?

如题所述

第1个回答  2020-09-09
7/9-7/9×3/5+2/5
=7/9×(1-3/5)+2/5
=7/9×2/5+2/5
=(1+7/9)×2/5
=16/9×2/5
=32/45本回答被网友采纳
第2个回答  2020-09-09
7/9-7/9x3/5+2/5
=7/9x(1-3/5)+2/5
=7/9x2/5+2/5
=2/5x(7/9+1)
=2/5x16/9
=32/45
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