Question

folosind proporțiile derivate sa se afle x din propozitiile:​

Answer 1

Răspuns:

a.5(x+1)=6x

5x+5=6x

5=6x-5x=>x=1

b.14(4x+2)=4x·15

56x+28=60x

28=60x-56x

x=28:4=>x=7

c. 2x·16=10(3x+1)

32x=30x+10

32x-30x=10

x=10:2=>x=5

d. 16/25=8x/(10x+5)

16(10x+5)=25·8x

160x+80=200x

80=200x-160x

x=80:40=>x=2