Question

a) [(1,5+X)·2+1,3]=10
b) {[52-(4,5·X+1)+3,4]:2+22}·3=144
Vr si cu unul sub altul. ;)

Answer 1

(1,5+X)·2+1,3=10
(1,5 + X)×2 = 10 - 1,3
(1,5 + X) ×2 = 8,7
1,5 + X = 8,7 : 2
1,5 + X = 4,35
X = 4,35 - 1,5
X = 2,85


{[52-(4,5·X+1)+3,4]:2+22}·3=144
[52-(4,5·X+1)+3,4]:2+22 = 144 : 3
[52-(4,5·X+1)+3,4]:2+22 = 48
[52-(4,5·X+1)+3,4]:2 = 48 - 22
[52-(4,5·X+1)+3,4]:2 = 26
52-(4,5·X+1)+3,4 = 26 × 2
52-(4,5·X+1)+3,4 = 52
52-(4,5·X+1) = 52 - 3,4
52-(4,5·X+1) = 48,6
4,5×X +1 = 52 -48,6
4,5×X +1 = 3,4
4,5×X = 3,4-1
4,5×X = 2,4
X = 2,4 / 4,5