X+13%x-28%x=3.4 120-25%x=100 怎莫算

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X+13%x-28%x=3.4 120-25%x=100 怎莫算
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X+13%x-28%x=3.4 120-25%x=100 怎莫算
X+13%x-28%x=3.4 120-25%x=100 怎莫算

X+13%x-28%x=3.4 120-25%x=100 怎莫算
(1)
X + 13%X - 28%X = 3.4
(100%+13%-28%)X = 3.4
85%X = 3.4
X = 3.4 ÷ 85% = 4
(2)
120 - 25%X = 100
120 - 100 = 25%X
20 = 25%X
X = 20 ÷ 25% = 80