5/9-x=8/7-9/4解方程?
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解:解方程, 此方程的解为x = 419/252
5/9 - x = 8/7 - 9/4
5/9 - x = 32/28 - 63/28
5/9 - x = -31/28
x = 5/9 + 31/28
x = (5×28)/(9×28)+(31×9)/(28×9)
x = 140/252 + 279/252
x = (140+279)/252
∴x = 419/252
答:此方程的解为x = 419/252
5/9 - x = 8/7 - 9/4
5/9 - x = 32/28 - 63/28
5/9 - x = -31/28
x = 5/9 + 31/28
x = (5×28)/(9×28)+(31×9)/(28×9)
x = 140/252 + 279/252
x = (140+279)/252
∴x = 419/252
答:此方程的解为x = 419/252
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