方程式～～急～急

1) 9(x+5)=4(2x+7)
9x+45=8x+28
9x-8x=28-45
x= -17

2) x-5/2=1+x/4
4(x-5/2)=4(1+x/4)
4x-10=4+x
4x-x=4+10
3x=14
x=14/3

3) 5x-3/4=7x+1/3
12(5x-3/4)=12(7x+1/3)
60x-9=84x+4
60x-84x=4+9
-24x=13
x= -13/24

4) X-1/5 - 4-X/2 =2
10(X-1/5 - 4-X/2)=10(2)
10x-2-40+5x=20
10x+5x=20+2+40
15x=62
x=62/15

ans:
1) 9(x+5)=4(2x+7)
9x+45=8x+28
9x-8x=28-45
x= -17

2) x-5/2=1+x/4
4(x-5/2)=4(1+x/4)
4x-10=4+x
4x-x=4+10
3x=14
x=14/3

3) 5x-3/4=7x+1/3
12(5x-3/4)=12(7x+1/3)
60x-9=84x+4
60x-84x=4+9
-24x=13
x= -13/24

4) X-1/5 - 4-X/2 =2
10(X-1/5 - 4-X/2)=10(2)
10x-2-40+5x=20
10x+5x=20+2+40
15x=62
x=62/15

1).
9(X+5)=4(2X+7)
9X+45=8X+28
9X+17=8X
9X-8X=-17
X=-17

1)X=-7

2).
X-5/2=1+X/4
X=1+X/4+5/2
X=7/2+X/4
4X=14+X
3X=14
X=14/3
X=4.6666666666666666667

2.)X=4.6666666666666666667

3).
5X-3/4=7X+1/3
5X=7X+13/12
-13/12=2X
X=-13/24

3.)X=-13/24

4.)
X-1/5 - 4-X/2 =2
X-1/5=2+ 4-X/2
10X-2=2+20-5X
15X=2+20+2
15X=24
X=24/15
X=8/5
X=1 3/5
X=1.6

4.)X=1.6

1).
9(X+5)=4(2X+7)
9X+45=8X+28
9X-8X=28-45
X= -17

2).
X-5/2=1+X/4
4(X-5/2)=4(1+X/4)
2(X-5)=1+X
2X-10=1+X
2X-X=1+10
X=11

3).
5X-3/4=7X+1/3
12(5X-3/4)=12(5X-3/4)
3(5X-3)=4(7X+1)
15X-9=28X+4
-9-4=28X-15X
-13=13X
-1=X
X= -1

4).
X-1/5 - 4-X/2 =2
10(X-1/5 - 4-X/2) =20
2(X-1)-5(4-X) =20
2X-2-20+5X =20
7X-22 =20
7X =20+22
7X =42
X =42/7
X=6



希望可以幫到你~

1)
9(X+5)=4(2X+7)
9X+45=8X+28
9X-8X=28-45
X=-17
2)X-5/2=1+X/4
4X-10=4+X
4X-X=4+10
3X=14
X=14/3
3)5X-3/4=7X+1/3
60X-9=28X+4
60X-28X=4+9
32X=13
X=13/32
4).X-1/5 - 4-X/2 =2
10X-2-19-5X=2
5X=2+2+19
5X=23
X=23/5

1) 9X+45=8X+28
X= -17
2) 4X-10= 4+X
3X=14
X=14/3
3) 60X-9=84X+4
24X=-13
X=-13/24
4) X-X/2=2+1/5+4
X/2=31/5
X=62/5

1) 9(X+5)=4(2X+7)
9X+45=8X+28
9X+45-28=8X+28-28
9X+17=8X
9X-8X= -17
X=-17