6题,要正确,
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6题,要正确,
6题,要正确,
6题,要正确,
D C 1487/X-1487/(x+70)=3 D D
2x=3(x-3)
2x=3x-9
x=9
x(x+2)-1=x²-4
x²+2x-1-x²+4=0
2x=-3
x=-3/2
x+2(x-2)=x+2
x+2x-4=x+2
2x=6
x=3
(2x+2)(x-2)-(x+2)x=x²-2
2x²-4x+2x-4-x²-2x=x²-2
-4x-4=-2
-4x=-2+4
x=-1/2