(5x/2-5):(x+5)=4:3
15x/2-15=4x+20
7/2x=35
x=10
等价于11(x-18-1/4x)=9(18+1/4x)
即:6x=360
x=60
3(2x+5)=15
6x+15=15
6x=0
x=0
(1-1/11)X=(47-X)-5,
10/11X=47-X-5,
10/11X=42-X,
10/11X+X=42,
21/11X=42,
X=22。
0.8:(4/13)=(5-x):0.25
0.8X0.25=(4/13)X(5-x)
0.2X13=20-4x
4x=20-2.6
x=17.4÷4
x=4.35
15:30/7=52.5:15=3.5=17.5/5
(1200-x)+(1200-x-2/5x)
=1200-x+1200-x-2/5x
=2400-2/5x
是不是题目记错了
解:
列式子:
4.5X=4×(2+X)
4.5X=8+4X
0.5X=8
X=8÷0.5
X=16
2(5x-4)=3(2x+1)
解:10x-8=6x+3
10x-6x=3+8
4x=11
x=2.75
4(5x+2)=148
5x+2=37
5x=35
∴x=7.