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MayraMoldoveanu
a fost răspuns

rezolvati ecuatiile:
A.(x-1)/2=(x+1)/3
B.4*(x+5)=28
C.[2*(2x+8)]/16=15

Răspuns :

Spidie
A.(x-1)/2=(x+1)/3
3x-3=2x+2
3x-2x=3+2
x=5

B.4*(x+5)=28
4x+20=28
4x=28-20
4x=8
x=2

C.[2*(2x+8)]/16=15
2*(2x+8)=16*15
4x+16=240
4x= 240-16
4x=224
x= 56
C)  [2*(2x+8)]/16=15 |·16 ⇒2*(2x+8) =15·16 |:2 ⇒2x+8 =15·8 ⇒

⇒ 2(x+4) = 15·8 |:2⇒ x+4 = 15·4 ⇒ x = 15·4 - 4



B) 4*(x+5)=28 |:4 ⇔ x + 5 = 7 ⇔ x = 7 - 5



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