giải phương trình
a) −6(−x2−x+1)4+x2(−x2−x+1)2+5x4=0−6(−x2−x+1)4+x2(−x2−x+1)2+5x4=0
b) x4+9=5x(x2−3)x4+9=5x(x2−3)
c) x4+(x+1)(5x2−6x−6)=0x4+(x+1)(5x2−6x−6)=0
d)(x2+1)2+(x+1)(3x2+2x−2)=0(x2+1)2+(x+1)(3x2+2x−2)=0
e) x2(x−1)2+x(x2−1)=2(x+1)2
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