作业帮(90-X）\(100-X）=80% 怎么解
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(90-X）\(100-X）=80% 怎么解
(90-X）\(100-X）=80% 怎么解
(90-X）\(100-X）=80% 怎么解
(90-X）\(100-X）=80%
90-x=0.8(100-x)
90-x=80-0.8x
x-0.8x=90-80
0.2x=10
x=50