Question

1) 2×X=19,4. Aflati X.

2) 2×x+5,63=11,23. Aflati X.

3) Media aritmetica a2 nr. 11,5. Aflati nr. stiind ca sunt consecutive.

Answer 1

1.
2*X=19.4
X=19.4:2
X=9.7
2*9.7=19.4

2.
2*X+5.63=11.23
2*X=11.23-5.63
2*X=5.6
X=5.6:2
X=2.8
2*2.8+5.63=5.6+5.63=11.23

3.
(11+12):2=23;2=11.5