7/9÷(11/5)+2/9÷(5/11)这道题怎么做?
2021-01-20
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原式=7/9×(5/11)+2/9×(11/5)
=(7×5)/(9×11)+(2×11)/(9×5)
=35/(9×11)+22/(9×5)
=35×5/(9×11×5)+22×11/(9×5×11)
=417/495
=139/165
=(7×5)/(9×11)+(2×11)/(9×5)
=35/(9×11)+22/(9×5)
=35×5/(9×11×5)+22×11/(9×5×11)
=417/495
=139/165
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