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a fost răspuns

7) Rezolvati in z ecuatiile:

a) 2(x+1)-5=x-3 c) 4(x+3)-7=5x-1

b) 3+5(x-2)=3x-7

Răspuns :

a) 2x+2-5=x-3 echivalent cu 2x-3=x-3 echivalent cu 2x-x=3-3 echivalent cu x=0
b)3+5x-10=3x-7 echivalent cu 5x-7=3x-7 echivalent cu 5x-3x=7-7 echivalenrt cu 2x=0 x=0
c)4x+12-7=3x-7 echivalent cu 4x+12-7+7=3x echivalent 4x+12=3x rezulta x=12

a)
2(x+1)-5=x-3

2x+2-5=x-3

2x-x= 5-2-3

x=0

b) 3+5(x-2)=3x-7

3+ 5x-10=3x-7

5x-3x= 10-7-3

2x=0

x=0

c)  4(x+3)-7=5x-1

4x+12-7=5x-1

12-7+1=-5x-4x

6=x