Question

Aflaţi termenul necunoscut x din:
a) 813 - x=214;
d) 400 - (20 + 30 + x) = 100;
b) 118 - x + 90 = 121;
e) 80 + x - 40 + 70 = 435;
c) x – 15 – 2 = 25;
f) 25 + x – 10 + x = 45.​

Answer 1

a) x=813-214= 599
d) 400-(50+x)=100
400-50-x=100
350-x=100
x=350-100=250
b) 118+90-x=121
208-x=121
x=208-121= 87
e) 80-40+70+x=435
110+x=435
x=435-110= 325
c) x= 25+15+2=42
f) 25-10+x+x=45
15+2x=45
2x=45-15
2x=30
x=15