Question

Exercitiul 2 va rog...
Dau coroana

Answer 1

a)10/n=5/3
5n=10x3
5n=30
n=30:5
n=6
b)15/(x+3)=3/7
(x+3)x3=15x7
3x+9=105
3x=105-9
3x=96
x=96:3
x=32
c)(a-4)/(a+8)=1/7
a+8=(a-4)x7
a+8=7a-28
a-7a= -28-8
-6a= -36
a=36:6
a=6
d)(4y-3)/3=(3y+6)/5
(4y-3)x5=3x(3y+6)
20y-15=9y+18
20y-9y=18+15
11y=33
y=33:11
y=3
e)(25-x)/4=x
25-x=4x
-x-4x= -25
-5x= -25
x=25:5
x=5