Question

Rezolvati ecuaatiile urmatoare in multimea numerelor naturale: 
1.  4x+3=2(2x+13)-5
2.  11x+12=3x+36
3.  x-7=x+13
4.  x+2x+3x=3(2x+7)
5.  6x-4x+13=2x+2 ori 5+3
6.  7x+12=3x+4
PLSS VA ROG REPEDE CA TREBUIE SA PLEC LA SCOALA

Answer 1

1.4x+3=4x+26-5
4x-4x=21-3=18
0=18 imposibil
2)11x+12=3x+36
11x-3x=36-12
8x=24
x=3
3)x-7=x+13
x-x=7+13
0=20 imposibil
4)x+2x+3x=3(2x+7)
6x=6x+21
6x-6x=21
0=21imposibil
5)6x-4x+13=2x+2x5+3
2x+13=2x+13

2x-2x=13-13
0=0
x =N   
6)7x+12=3x+4
7x-3x=4-12
4x=-8
x=-2     xapartineR  nu  stiu daca ai  invatat,deci x=-2

Answer 2

1. 4x+3=2(2x+13)-5
4x+3=4x+26-5
4x+3=4x+21
3=21
solutii nu are ecuatia
x=Ф

2. 11x+12=3x+36
11x-3x=36-12
8x=24
x=24:8
x=3



3. x-7=x+13
x-x=13+7
0=20
ecuatia nu are solutii
x=Ф


4. x+2x+3x=3(2x+7)
6x=6x+21
6x-6x=21
0=21
ecuatia nu are solutii
x=Ф


5. 6x-4x+13=2x+2 ·5+3
2x+13=2x+13
solutia are o infinitate de solutii
x∈N


6. 7x+12=3x+4
7x-3x=4-12
4x=-8
x=-8:4
x=-2