7x-5/4=3/8

题目

7x-5/4=3/8
2x-1/6=5x+1/8
1/2x-7=9x-2/6
2x+1/3-5x-1/6=1
3/10(200+x)-2/10(300-x)=300*9/25

答案

1.7x=3/8+5/4 x=(3/8+5/4)/7 = 13/56
2.2x-5x=1/8+1/6 -3x=15/24 x= -5/24
3.1/2x-9x=-2/6+7 -17/2x= 20/3 x= -40/51
4.-3x=1-1/3+1/6 -3x=5/6 x= - 5/18
5.3/10*200+3/10*x - 2/10*300+2/10*x = 300*9/25
3/10*x+2/10*x = 300*9/25
5/10*x = 300*9/25
x=300*9/25*10/5
=216