Question

规定a△b=a*x+a*b(b-a).而且2△3=3△4,那么4△5的值是多少

Answer 1

2△3=3△4

2x+2*3*(3-2)=3x+3*4*(4-3)

2x+6=3x+12

x=-6

4△5

=3*(-6)+4*5*(5-4)

=-18+20

=2