用适当方法解下列方程:(1)x²+7x+6=0 (2)x²-5x-6=0 (y²-17y+30=0(4)y²-7y-60=0 (5)x²+10x-11=0 (6)x²-12x-28=0 ,快

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 23:41:20

用适当方法解下列方程:(1)x²+7x+6=0 (2)x²-5x-6=0 (y²-17y+30=0(4)y²-7y-60=0 (5)x²+10x-11=0 (6)x²-12x-28=0 ,快
用适当方法解下列方程:(1)x²+7x+6=0 (2)x²-5x-6=0 (y²-17y+30=0
(4)y²-7y-60=0 (5)x²+10x-11=0 (6)x²-12x-28=0 ,快

用适当方法解下列方程:(1)x²+7x+6=0 (2)x²-5x-6=0 (y²-17y+30=0(4)y²-7y-60=0 (5)x²+10x-11=0 (6)x²-12x-28=0 ,快
(1)x²+7x+6=0
(x+1)(x+6)=0
x1=-1,x2=-6
(2)x²-5x-6=0
(x+1)(x-6)=0
x1=-1,x2=6
(3)y²-17y+30=0
(x-2)(x-15)=0
x1=2,x2=15
(4)y²-7y-60=0
(y+5)(y-12)=0
y1=-5,y3=12
(5)x²+10x-11=0
(x-1)(x+11)=0
x1=1,x2=-11
(6)x²-12x-28=0
(x+2)(x-14)=0
x1=-2,x2=14