[toán 10]hpt

H

hoc_hoj_la_chinh

he tuong duong: (1) x(2x+1)+y(y+3)=2
(2) xy(2x(y+3)+(y+3))=-8

(1) x(2x+1)+y(y+3)=2
(2) xy(2x+1)(y+3)=-8
dat x(2x+1)=a (3)
y(y+3)=b (4)

he tuong duong (1) a+b=2
(2) ab=-8
giai he tim a,b rui the vao (3),(4) de tim x,y
 
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