7x²+7x+19x+19=0
7x(x+1)+19(x+1)=0
(x+1)(7x+19)=0
x=-1,x=-19/7
7X平方+26X+19=0的解
7X平方+26X+19=0的解
數(shù)學(xué)人氣：237 ℃時(shí)間：2020-09-23 07:23:21
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