x2+18x-144=0144分解成6*24x2+18x-144=(x-6)(X+24)=0x=6或者x=-24
18x+x2=144x2+18x-144=0(x-6)(x+24)=0x1=6,x2=-24
先配方,得x2 18x 81=144 81=255即(x 9)2=15*15,所以x=6或-24
x2+18x-144=0144分解成6*24x2+18x-144=(x-6)(X+24)=0x=6或者x=-24
18x+x2=144x2+18x-144=0(x-6)(x+24)=0x1=6,x2=-24
先配方,得x2 18x 81=144 81=255即(x 9)2=15*15,所以x=6或-24