Question

Tìm các số nguyên x,y sao cho:

a) \(\frac{3}{x}\) + \(\frac{y}{3}\) = \(\frac{5}{6}\)

b) \(\frac{5}{x}\) - \(\frac{y}{3}\) = \(\frac{1}{6}\)

c) \(\frac{x}{6}\) - \(\frac{2}{y}\) = \(\frac{1}{30}\)

d) x . y = 7

e) (x - 3) . (y + 2) = -5

Answer 1

khó quá        

Answer 2

nguyễn trung hiếu học tiểu học mà               

Answer 3

3/x +Y/3=5/6

X=2 HOAC 6

NEU x=2 thif 3/2+y/3>5/6

=>x=6

3/6=1/2

ma 1/2 +1/3 = 5/6

=> y=1.

b) x=6 vi 5/2 qua lon

5/6-2/3=1/6

=>y=2

c)y=30vi neu y=30 thix/6 - 1/15=1/30

vay x/6=1/10

5/3x=1

=>x=3/5=0.6

d)vi 7 la so nguyen to nen x= 1:y=7 hay x=7:y=1

e)5 la so nguyen to nen x-3=1 hay x-3=5:y+2= 1 hay y+2=5

=>x=8:y=-1;x=4:y=2

Answer 4

a )

x= 2

y = 2

Answer 5

e)x.y=7

ta phân tích 7=1.7

ta thay x=1;y=7 

           x=7;y=1