Question

1. Ecuatia 2x-1=7,x∈N are ca solutie numarul 4,deoarece....... .
2.Solutie a ecuatiei 2x-3y=5 este: A. (-10;5) B. (4;1) C. (4; -1) D. (-10; -5) .
3.Rezolvati in R ecuatia: 2(1-3x)=14-2x
4.Doi muncitori au confectionat inpreuna 657 piese.Cite piese a confectionat fiecare muncitor,daca primul a confectionat cu 63 piese mai mult decit al doilea?

Answer 1

1. 2x-1=7; 2x=8; x=8/2; x=4.
2. 2x-3y=5 sol: B (4;1)
3.2 (1-3x)=14-2x
2-6x=14-2x
2-14=-2x+6x
-12=4x
x=-12/4
x=-3;
4. 657-63=594
594/2=287 (a confectionat primul muncitor)
287+63=350 (a confectionat al doilea muncitor)