(2y+1)²+3(2y+1)+2=0 解方程
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(2y+1)²+3(2y+1)+2=0 解方程
(2y+1)²+3(2y+1)+2=0 解方程
(2y+1)²+3(2y+1)+2=0 解方程
(2y+1)²+3(2y+1)+2=0
(2y+1+1)(2y+1+2)=0
(2y+2)(2y+3)=0
y=-1 y=-1.5