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答案:
1.x=-4. 2.x=-4 3.x=8 4.x=24 5.x=5. 6.x=-1/5.
7.x=-10 8.x=-1 9.x=-1 10.x=6 11.y=1/2 12.x=-11/10
13.x=-1/2 14.x=16 15.x=3 16.z=-1 17.x=-22 18.x=2
19.y=-5/3 20.x=-17 21.x=3.5 22.x=14/17 23.x=3/5
24.x=9 25.x=7 26.x=5 27.x=5 28.(1)x=4 (2) x=6/7 29.(1)x=2,x=-3/2.(2)x=-5/3,x=-25/3. (3)x=7,x=-1 30.x=-9