2x(3x+1)=9x+3
2x(3x+1)-3(3x+1)=0
(3x+1)(2x-3)=0
x1=-1/3 x2=3/2
（x＋8）（x＋1）＝12
x^2+9x+8-12=0
x^2+9x-4=0
下边用公式法解吧
.2x(3x+1)=9x+3（x＋8）（x＋1）＝12
2个回答
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