2(y-4)平方-11=0 9(y-3)平方-(y-2)平方=0 (x+1)(x+2)=4
问题描述:
2(y-4)平方-11=0 9(y-3)平方-(y-2)平方=0 (x+1)(x+2)=4
答
2(y-4)²-11=0
﹙y-4﹚²=11/2
y=4±√22/2
9(y-3)²-(y-2)²=0﹙3y-9-y+2﹚﹙3y-9+y-2﹚=0
﹙2y-7﹚﹙4y-11﹚=0
y1=7/2
y2=11/4
(x+1)(x+2)=4
x²+3x=2
﹙x+3/2﹚²=17/4
x=﹣3/2±√17/2