方程的练习题17(2-3y)-5(12-y)=8(1-7y)6(2-1/3y)-1/5(10-5y)=15(z-4)-7(7-z)-9=12-3(9-z)3(x-7)-2[9-4(2-x)]=221/2(y-2)+1/6(y-2)-1/3(y-2)

Question

方程的练习题
17(2-3y)-5(12-y)=8(1-7y)
6(2-1/3y)-1/5(10-5y)=1
5(z-4)-7(7-z)-9=12-3(9-z)
3(x-7)-2[9-4(2-x)]=22
1/2(y-2)+1/6(y-2)-1/3(y-2)

Answer 1

(1）34-51y-60+5y=8-56y -51y+5y+56y=8-34+60 10y=34 y=3.4 (2)12-2y-2+y=1 -2y+y=1-12+2 -y=-9 y=9 （3）5z-20-49+7z-9=12-27+3z 5z+7z-3z=12-27+20+49+9 9z=63 z=7 （4）3x-21-2（9-8+4x）=22 3x-21-18+16-8x=22 -5x-23=22 -5x=45 x=-9 （5）1/2y-1+1/6y-1/3-1/3y+2/3 1/3y-2/3