Հանրահաշիվ
x2+2y= -7
x-y=11
-y=11-x
y=x-11
x2+2x-15=0
4+60= 64
-2+8/2=3
-2-8/2=-5
x= 11+y= 11-3=-8
x= 11+y=11-5=-16
(x+y):(x-y)= 8:1
x2-y2=128
x+y/x-y
x+y=8x-8y
9y=7x
y=7x/9
x2-49×2/81=128
81×2-49×2= 10368
x2= 324
x=18
y= 127/9 = 14
x2+2y= -7
x-y=11
-y=11-x
y=x-11
x2+2x-15=0
4+60= 64
-2+8/2=3
-2-8/2=-5
x= 11+y= 11-3=-8
x= 11+y=11-5=-16
(x+y):(x-y)= 8:1
x2-y2=128
x+y/x-y
x+y=8x-8y
9y=7x
y=7x/9
x2-49×2/81=128
81×2-49×2= 10368
x2= 324
x=18
y= 127/9 = 14