Question

1) Rezolvati in ℚ ecuatiile: a) x+5=7
b)7-x=2
c)2 x+3=1
2)Rezolvati inℚ ecuatiile:a)2x-1=3
3 5 10

b)x-4x+7x=7
2 3 6

Answer 1

a) x+5=7
x = 7-5
x = 2
b) 7 - x = 2
7-2=x
x = 5
c)2x+3=1 
2x = 1 - 3
2x = -2|:2
x = -1
2) a) 2x - 1 = 3
2x = 3 + 1
2x = 4|:2
x = 2
b)x-4x+7x=7
-3x+7x=7
4x=7
x=7 supra 4

Answer 2

1) Primele 2 litere sunt ...de clasa I.

c) 2x+3=1⇔2x=1-3 ⇔ 2x=-2⇔x=-2:2⇔x=-1

2)
 a) 2x-1=3 ⇔2x=3+1 ⇔2x=4⇔x=2

 b)x-4x+7x=7⇔8x-4x=7⇔4x=7⇔x=7/4∈ℚ