Question

afla numarul necunoscut repede plissss. cu coroana!!!!!

Answer 1

a. 7/5-8/5+x=2/5 |·5
7-8+5x=2
-1+5x=2
5x=3
x=3/5
S={3/5}

b. 12/3-x-1=8/3 |·3
12-x-3=8
9-x=8
9-8=x
x=1
S={1}

c. 2/5+(2/5+2/5-x)-1/5=3/5
2/5+2/5+2/5-x-1/5=3/5
5/5-x=3/5
x=5/5-3/5
x=2/5
S={2/5}

Answer 2

Sper ca intelegi.
subpunctele a si b sunt jos, c e sus
doar am adus la acelasi numitor