Question

解方程17-2x+1=5，1/2=3x-1，4x-3（20-x）=3，6x+4/3=4x+5/4

Answer 1

17-2x+1=5
-2x = 5 - 18
-2x = -13
x = 13/2

1/2=3x-1
3x = 1/2 + 1
3x = 3/2
x = 1/2

4x-3（20-x）=3
4x - 60 + 3x = 3
7x = 3 + 60
7x = 63
x = 9

6x+4/3=4x+5/4
6x - 4x = 5/4 - 4/3
2x = -1/12
x = -1/24

追问

是对的么？

追答

已验算，对的

Answer 2

17-2(x+1)=5，
17-2x-2=5
-2x = 5-17+2 = -10
x=5

1/2=3x-1，
-3x = -1-1/2 = -3/2
x = 1/2

4x-3（20-x）=3，
4x-60+3x=3
7x=3+60=63
x=9

6x+4/3=4x+5/4
6x-4x=5/4-4/3
2x = (15-16)/12 = -1/12
x= -1/24

Answer 3

17-2x+1=5
2x=13
x=13/2
1/2=3x-1，
3x=3/2
x=1/2

4x-3（20-x）=3，
4x-60+3x=3
7x=63
x=9

6x+4/3=4x+5/4
2x=5/4-4/3=-1/12
x=-1/24