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+5=1250+5=1255
x+5+y=x+y+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*1250=2500

Answer 2

x+y=1250
x+y+5=1250+5=1255
x+5+y=1250+5=1255
3+x+y=+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*1250=2500