(1)(x+3)(2x-5) (2)(3x+2)(x-1)=3(x+1)(x-1)
1个回答
(1)(x+3)(2x-5)
=2x²-5x+6x-15
=2x²+x-15
(2)(3x+2)(x-1)=3(x+1)(x-1)
3x²-x-2=3x²-3
-x=-1
x=1
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