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第37頁(yè)

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解：?$3(1-x)=2(2x-4)$?
?$3-3x=4x-8$?
?$-7x=-11$?
?$x=\frac {11}{7}$?
解：?$2(2x-1)-(10x+1)=12$?
?$4x-2-10x-1=12$?
?$-6x=15$?
?$x=-\frac {5}{2}$?
解：?$3(3x+2)-2(x-5)=6$?
?$9x+6-2x+10=6$?
?$7x=-10$?
?$x=-\frac {10}{7}$?
解：?$30+3(x-2)=5x$?
?$30+3x-6=5x$?
?$-2x=-24$?
?$x=12$?
解：?$2(x-3)=6x-(3x-1)$?
?$2x-6=6x-3x+1$?
?$-x=7$?
?$x=-7$?
解：?$6x-2(1-x)=(x+2)-6$?
?$6x-2+2x=x+2-6$?
?$7x=-2$?
?$x=-\frac {2}{7}$?
解：?$2(x-2)-3(1+x)=-12$?
?$2x-4-3-3x=-12$?
?$-x=-5$?
?$x=5$?
解：?$2(1-y)-6y=18-3(y+2)$?
?$2-2y-6y=18-3y-6$?
?$-5y=10$?
?$y=-2$?
解：?$\frac 12[\frac 12x+\frac 12]=\frac 23(x-1)$?
?$\frac 14x+\frac 14=\frac 23(x-1)$?
?$3x+3=8(x-1)$?
?$3x+3=8x-8$?
?$-5x=-11$?
?$x=\frac {11}{5}$?
解：?$4(2x-1)-2(10x-1)=3(2x+1)-12$?
?$8x-4-20x+2=6x+3-12$?
?$-18x=-7$?
?$x=\frac {7}{18}$?
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