这样解更简单:
解:令a-6=x, a=x+6; a-8=x-2.
(x-2)²+x³=8, x³+x²-4x-4=0,
x²(x+1)-4(x+1)=0, (x+1)(x²-4)=0.
(x+1)(x+2)(x-2)=0, x₁=-1; x₂=-2;
x₃=2. a₁=5; a₂=4; a₃=8.
这样解更简单:
解:令a-6=x, a=x+6; a-8=x-2.
(x-2)²+x³=8, x³+x²-4x-4=0,
x²(x+1)-4(x+1)=0, (x+1)(x²-4)=0.
(x+1)(x+2)(x-2)=0, x₁=-1; x₂=-2;
x₃=2. a₁=5; a₂=4; a₃=8.