解方程(x²-x+4)x-(x-1)(x²+2)=x+7
问题描述:
解方程(x²-x+4)x-(x-1)(x²+2)=x+7
答
(x²-x+4)x-(x-1)(x²+2)=x+7
x³-x²+4x-x³+x²-2x+2=x+7
2x+2=x+7
2x-x=7-2
x=5