7/9-7/9×3/5+2/5,脱式计算?
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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
=7/9×(1-3/5)+2/5
=7/9×2/5+2/5
=(1+7/9)×2/5
=16/9×2/5
=32/45
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