(1) x = -7 / 3
(2) x = 3 / 4
(3) x = 7
(4) x = 1
(5) x = -1 / 9
(6) x = 66
(7) x = -6 / 5(是否少打括号?)
(8) x = -1 / 4
(1)3x-2=-5 3X=-5+2 3X=-3 X=-1
(2)-5x+2=3x-4 -5X-3X=-4-2 -8X=-6 X=4/3
(3)2x-3(10-x)=5 2X-30+3X=5 5X=30+5 X=7
(4)3(x-1)=3-(2x+1) 3X-3=3-2X-1 3X+2X=3-1+3 5X=5 X=1
(5)1-3(x+1/3)=1/3 1-3X-1=1/3 -3X=1/3 X= -1/9
(6)1/2x+5=2/3x-6 1/2X-2/3X=-6-5 -1/6X=-11 X=66
(7)(x-3)/3=(2x+1)/5 5X-15=6X+3 5X-6X =3+15 -X=18 X=-18
(8)(2x-1)/2-(4X+3)/3=1 3(2X-1)-2(4X+3)=6 6X-3-8X-6=6 -2X=15 X=-15/2
(1)x=-1
(2)x=3/4
(3)x=7
(4)x=1
(5)x=-1/9
(6)x=66
(7)x=-3/5
(8)x=-1/4
(1) -1
(2)0.75.也就是3/4.
(3)7
(4)1
(5)- 1/9
6.X=66
7.X=-1.2
8.X=-0.25