x^2=(x+3)^2-(x+1)^2+(x+4)^2-(x+2)^2,
x^2=2(2x+4)+2(2x+6),
x^2=4x+8+4x+12,
x^2-8x-20=0,
(x+2)(x-10)=0,
解得x1=-2,x2=10.
x²+(x+1)²+(x+2)²=(x+3)²+(x+4)²怎样化简
x²+(x+1)²+(x+2)²=(x+3)²+(x+4)²
x²+x²+2x+1+x²+4x+4=x²+6x+9+x²+8x+16
3x²+6x+5-2x²-14x-25=0
x²-8x-20=0
(x-10)(x+2)=0
x=10 or x=-2