导读：5.x²+4x=10 6.x²-6x=11 7.3x²+8x-3=0 8.x²+3x+1=0 9.2x²=6+7x 10.3x²-9x+2=0 11.x²-7x-18=0 12.2x²-9+8=0 13.16x²=8x=3 14.5x+2=3x²15.(3x-5)(x-2)=1 16.x-2=x(x-2)17.(x+2)(x-...

x²-5x+6=0
x²+6x+5=0
x²-3x-4=0
x²+7x-18=0
x²-4x+2=0
x²-2x-2=0
3x²-5x-2=0
(x-1)²-5(x-1)+6=0
x²+x=1
x²+x=72