Question

Se stie ca x+y =1250 Calculati
x+y+5
x+5+y
3+x+y
x-3+y
x+(y+10)
x+x+y+y

Answer 1

$x+y=1250 \\ x+y+5=1250+5=1255 \\ x+5+y=(x+y)+5=1250+5=1255 \\ 3+x+y=3+1250=1253 \\ x-3+y=(x+y)-3=1250-3=1247 \\ x+(y+10)=x+y+10=1250+10=1260 \\ x+x+y+y=2x+2y=2(x+y)=2 \times 1250=2500$