1. 0.4y^2+0.8y-1=0 2. 6x^2-x-12=10
1个回答
6x^2-x-12=0
(3x+4)(2x-3)=0
x=-4/3或x=3/2
另一题用求根公式!-b±√(b^2-4ac)/2a
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