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展开全部
解:5/7÷8/9+8/7÷7/5-5/7
=5/7×9/8+8/7×5/7-5/7
=5/7x(9/8+8/7-1)
=5/7x(9/8+1/7)
=5/7×71/56
=355/392
=5/7×9/8+8/7×5/7-5/7
=5/7x(9/8+8/7-1)
=5/7x(9/8+1/7)
=5/7×71/56
=355/392
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展开全部
5/7÷8/9+8/7÷7/5-5/7
=5/7×9/8+8/7×5/7-5/7
=5/7×(9/8+8/7)-5/7
=5/7×127/56-5/7
=635/392-5/7
=635/392-280/392
=355/392
=5/7×9/8+8/7×5/7-5/7
=5/7×(9/8+8/7)-5/7
=5/7×127/56-5/7
=635/392-5/7
=635/392-280/392
=355/392
追答
5/7÷8/9+8/7÷7/5-5/7
=5/7×9/8+8/7×5/7-5/7
=5/7×(9/8+8/7)-5/7
=5/7×127/56-5/7
=635/392-5/7
=635/392-280/392
=355/392
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