For the rational number x, y, a new operation ※: x y = ax+by+c, where a, b, c are constants, and the right side of the equation is the usual addition and multiplication operations. A.1 B.-1 C.11 D.-11

For the rational number x, y, a new operation ※: x y = ax+by+c, where a, b, c are constants, and the right side of the equation is the usual addition and multiplication operations. A.1 B.-1 C.11 D.-11

3 5=15,4※7=28X y=ax+by+c 3a+5b+c=15(1)4a+7b+c=28(2) From (2)-(1): a+2b=13(3) From (2):4a+8b-b+c=284(a+2b)-b+c=284×13-b+c=28-b+c=-24(4) So (3)+(4): a+2b-b+c=-24+13(i.e. a...

In the original operation method of rational number, we add the following new operation: when a≥b, a b=2b, when a < b, a b=a, then x=2 Find the value of (1 x)·x-(3 x)("." and "-" are still multiplication and subtraction signs in rational operation)

(1 X)·x-(3 x)
=1*2-4
=2-4
=-4