Question

calcule o valor numerico das expresoe a)x-y,para x=3 e y =7 b)x-y,para X= -3 e Y =-7 c)5xy-xpara x =2e Y=-1 d)2x+3ypara x =0,5 e Y=0,5

Answer 1

a -4 b +4 c -12 d +2,5