求未知数x-25%x=41538÷38x=185x-334=25．

Question

求未知数
x-25%x= (4)/(15)
(3)/(8) ÷ (3)/(8) x= (1)/(8)
5x-3 (3)/(4) =25．

Answer 1

（1）x-25%x= (4)/(15)
（1-25%）x= (4)/(15)
75%x= (4)/(15)
75%x÷75%= (4)/(15) ÷75%
X= (16)/(45)

（2） (3)/(8) ÷ (3)/(8) x= (1)/(8)
(3)/(8) ÷ (3)/(8) x× (3)/(8) x= (1)/(8) × (3)/(8) x
(3)/(8) = (3)/(64) x
(3)/(64) x÷ (3)/(64) = (3)/(8) ÷ (3)/(64)
x=8

（3）5x-3 (3)/(4) =25
5x-3 (3)/(4) +3 (3)/(4) =25+3 (3)/(4)
5X=28 (3)/(4)
5X÷5=28 (3)/(4) ÷5
X= (23)/(4)