x^2+x-12=0 x^2-√2 x-1／4=0 x^2+4x+8=2x+11 x(x-4)=2-8x x^2+2x=0 急
问题描述：
x^2+x-12=0 x^2-√2 x-1／4=0 x^2+4x+8=2x+11 x(x-4)=2-8x x^2+2x=0 急
x^2+x-12=0
x^2-√2 x-1／4=0
x^2+4x+8=2x+11
x(x-4)=2-8x
x^2+2x=0
999 天不9我 地不9我 9我
答
解x²+x-12=0(x-3)(x+4)=0x-3=0或x+4=0x1=3,x2=-4x²-(√2)x-1/4=0x²-(√2)x=1/4x²-(√2)x+(√2/2)²=1/4+(√2/2)²(x-√2/2)²=3/4x-√2/2=±√(3/4)x-√2/2=±√3/2x-√2/2=√3/2或...