Question

Ajutor !! 
a) 3/5 x + 1/2 = 7/8
b) x : 7/5 =6/7
c) 0,2:x=0,5
d) 7/8 : x=21/16
e) ( x+1/2) ori 1/6=3/4
f) 3x/2 ( 1/2+1)=9/4
g) 22 + x/7= 5(x-6)/3

va rog mult sa ma ajutati

Answer 1

a) Numit. com. = 40
24x + 20 = 35
24x = 15, x = 15/24, x = 5/8

b) x/1 * 5/7 = 6/7
5x/7 = 6/7
35x = 42 (simplificam cu 7)
x = 6/5

c) 2/10 * 1/x = 5/10
2/10x = 5/10
50x = 20
x=2/5

d) 7/8 * 1/x = 21/16
7/8x = 21/16
168x = 112
x = 112/168
x = 2/7

e) (2x +1)/2 * 1/6 = 3/4
(2x +1)/12 = 3/4
8x + 4 = 36
8x = 32
x = 32/8
x = 4  

f) 3x/2 * 3/2 = 9/4
9x/4 = 9/4
36x = 36
x = 1


g)  (154 + x)/7 = (5x - 30)/3
35x - 210 = 462 + 3x
32x = 672
x= 672/32
x = 21

Multa bafta