x²+2.4x+0.44=0（x+1.2)²-1.2²+0.44=0（x+1.2)²-1.44+0.44=0（x+1.2)²=1x+1.2=±1当x+1.2=1时,x=1-1.2=-0.2当x+1.2=-1时,x=-1-1.2=-2.2“yzwb我爱我家”很高兴与您共同探讨该问题....