) 1.(x+2)*3=(X-1)*4 2.2x=(50-x)+40 3.30x=(9-x)*24

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) 1.(x+2)*3=(X-1)*4 2.2x=(50-x)+40 3.30x=(9-x)*24

) 1.(x+2)*3=(X-1)*4 2.2x=(50-x)+40 3.30x=(9-x)*24
) 1.(x+2)*3=(X-1)*4 2.2x=(50-x)+40 3.30x=(9-x)*24

) 1.(x+2)*3=(X-1)*4 2.2x=(50-x)+40 3.30x=(9-x)*24
(x+2)*3=(X-1)*4
3x+6=4x-4
4x-3x=6+4
x=10
2x=(50-x)+40
2x=50-x+40
2x+x=90
3x=90
x=30
30x=(9-x)*24
30x=216-24x
30x+24x=216
54x=216
x=4

1.
3x+6=4x-4
移项,得
3x-4x=-4-6
.∴ x=10
2.
2x=50+40-x
移项,得
3x=90
∴ x=30
3.
30x=216-24x
移项,得
54x=216
∴x=4

X1=-2
X2=30
X3=4
======================
过程:
3X-6=4X-4 -6+4=4X-3X X=-2
2X=90-X 3X=90 X=30
30X=9*24-24X 54X=9*24 X=4

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