Question

13x + 19y + 4x - 2y với x + y = 100

Answer 1

13x+19y+4x-2y

=(13x+4x)+(19y-2y)

=17x+17y=17(x+y)=17*100=1700

Answer 2

3900      

Answer 3

= (13x + 4x )+ (19y - 2y)

=17x + 17y

=17 X ( x+y)

=17 x 100

=1700