Răspuns:
Explicație pas cu pas:
1)
1/3=x/14
x=14*3
x=42 (nr mare)
42-14= 28 (diferenta ) B
2)
a= 3/2
b=2/10=1/5
a/b= (3/2)/(1/5
a/b=3/2*5/1
a/b= 15/2
a/b= 7,5 ( A)
3)
x/y= 3/5 →x=3y/5
(5x-y) /(2y-3x) = (5*3y/5)/ (2y-3*3y/5)
= (3y-y) /2y/(y/5)-9y/5)
= 2y*5/y
= se simplifica y cu y
= 2*5
= 10
-
4)
(5x+3y) /(7x-y) = 17/16
17*( 7x-y )= 16*( 5x+3y)
119x -17y= 80x +48 y
119x- 80x =48y+17y
39x = 65 y
y/x =39/65
y/x= 0,6 (D)
