解方程:1:x²+2x=02:x²-8=03:x²+3x+2=04:x²-2x+1=05:x²+x+2=0共十题.
解方程:1:x²+2x=02:x²-8=03:x²+3x+2=04:x²-2x+1=05:x²+x+2=06:-x²+4x+5=07:-2x+x²=08:x²-5x+6=09:x²+6x+9=010:2x²+x-3=0