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AlexandraAlly20
a fost răspuns

Folosind proportii derivate rezolvati:
a)2+x/x-1=7/6
b)2x+5/24=x+1/8
c)3x-1/7=5x+4/12,8

Răspuns :

Cioroiuroxana
6(2+x) = 7(x-1) ⇔ 12+6x=7x-7⇔12+7=7x-6x⇔19=x
8(2x+5)=24(x+1) ⇔ 16x+40 = 24x +24 ⇔ 24x-16x= 40-24 ⇔8x=16 ⇔ x=2
12,8(3x-1)=7(5x+4) ⇔ 38,4x-12,8=35x+28 ⇔ 38,4x-35x=28+12.8 ⇔ 3,4x=40,8 ⇔ x=12

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