2 a的平方 + 5a = —3
2a^2+5a+3=0
(a+1)(2a+3)=0
a+1=0 a1=-1
2a+3=0 a=-1.5
a的平方—3a+2=0
a^2-3a+2=0
(a-2)(a-1)=0
a1=2 a2=1
2 a的平方 + 5a = —3 怎么解 还有 a的平方—3a+2=0 怎么解
2 a的平方 + 5a = —3
2a^2+5a+3=0
(a+1)(2a+3)=0
a+1=0 a1=-1
2a+3=0 a=-1.5
a的平方—3a+2=0
a^2-3a+2=0
(a-2)(a-1)=0
a1=2 a2=1