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sa se determine x din egalitatile
a)x+1/5=4/2

b)3/5=7x-2/20

c)5x-2/2x+3=8/7


Răspuns :

a)(x+1):5=4:2
2x(x+1)=4x5
2x+2=20
2x=20-2
2x=18
x=18:2
x=9
b)3:5=(7x-2):20
5x(7x-2)=3x20
35x-10=60
35x=60+10
35x=70
x=70:35
x=2
c) (5x-2):(2x+3)=8:7
7x(5x-2)=8x(2x+3)
35x-14=16x+24
35x-16x=24+14
19x=38
x=38:19
x=2
a)2(x+1)=20
2x+2=20
2x=18 =>x=9

b)5(7x-2)=60
35x-10=60
35x=70 =>x=2

c)8(2x+3)=7(5x-2)
16x+24=35x-14
16x-35x=-24-14
-19x=-38 =>x=2