Question

Se stie ca x+y=1250 . Calculati :
a) x+y+5 =
b) x+5+y=
c) 3+x+y=
d) x-3+y=
e) x+(y+10)=
f) x+x+y+y =

Answer 1

a)1250+5=
b)1250+5=
c)3+1250=
d)1250+3=
e)1250+10=
f)1250+1250=

Answer 2

$x+y=1250 \\ a).x+y+5=1250+5=1255 \\ b).x+5+y=(x+y)+5=1250+5=1255 \\ c).3+x+y=1250+3=1253 \\ d).x-3+y=(x+y)-3=1250-3=1247 \\ e).x+(y+10)=x+y+10=1250+10=1260 \\ f).x+x+y+y=2x+2y=2(x+y)=2 \cdot 1250=2500$