Question

va rog mult ex: dau coroana va rog din suflet.

Answer 1

4)

a) 2x-1=5

2x=5-1, 2x=4, x=4/2, x= 2

b) 12(x-1)=144, 12x-12=144, 12x= 144-12, 12x=132, x=132/12, x=11

c) (32+x)/5=8, 32+x=8*5, 32+x=40, x=40-32, x=8

5)

14+10=24;  14-10=4; 24/4=6

6)

a) 2a+b=10

    a+2b=11

le adunam si obtinem 3a+3b =21

3(a+b)=21, a+b=21/3; a+b=7

b) 3a+4b=26

  2a + b=29

le adunam : 5a+5b=55; 5(a+b)=55; a+b=55/5; a+b=11