中一方程式

1)5x-3x =-8
2x = -8
x = -4

2) 4x-x+3=2x-1
3x+3=2x+1
x=-2

3) 4(5-2z) =-3(5z-2)
20-8z=-15z+6
-8z+15z=6-20
7z=-14
z=-2

4) 5分之2y+2分之y=3
(2y/5)+(y/2)=3
(4y/10)+(5y/10)=3
(9y/10)=3
9y=30
y=10/3

(1.)5x-3x=-8
2x=-8
x=-4

(2.)4x-x 3=2x-1
3x 3=2x-1
3x-2x=-4
x=-4

(3.)4(5-2z)=-3(5z-2)
20-8z=-15z 6
7z=-14
z=-2

(4.)9y=30
y=3又3分之1


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1)5x-3x =-8
2x=-8
2除以2=-8除以2
x=4

2) 4x-x+3=2x-1
4x-x-2x=-1-3
x = -4

3) 4(5-2z) =-3(5z-2)
20-8z =-15z-6
-8z+15z=-6-20
7z =-26
7z除以7 =-26除以7
z=-7分之26

4)5分之2y+2分之y=3
10(5分之2y)+10(2分之y)=3
2(2y)+5y=3
4y+5y=3
9y=3
9y除以9=3除以9
y=3分之1

1)5x-3x =-8
2x=-8
x=-4

2) 4x-x+3=2x-1
3x+3=2x-1
x=-1-3
x=-4

3) 4(5-2z) =-3(5z-2)
20-8z=-15z-6
15z-8z=-6-20
7z=-26
z=-3.71

4) 5分之2y+2分之y=3
2y/5 + y/2 = 3
4y/10 + 5y/10 = 3
9y/10=3
9y=30
y=3.33