(1)化简: x 2 -9 x 2 +6x+9 • 1 2x-6
1个回答
(1)原式=
(x+3)(x-3)
(x+3 ) 2 •
1
2(x-3) =
1
2x+6 ;
(2)去分母得:7x=5x-10,
解得:x=-5,
经检验x=-5是分式方程的解.
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