325210用公式法解3x2+5（2x+1）=03x2+10x+5=0x=[-10±√(102-4*3*5)]/(2*3)=(-5±√10)/3解：-3x2-5x+2=0x2+5x/3-2/3=0x2+5x/3+25/36=2/3+25/36(x+5/6)2=24/36+25/36=49/36(x+5/6)2=49/36x=-5/6±7/6x1=-5/6+7/6=1/3或x2=-5/5-7/6=-22，超级幻影猫231完美通关攻略31怎么过首先开始我们3-1的游戏开局老规矩，先别急着过关，往左走可以看