Question

对于有理数x,y定义一种运算“*”x*y=ax+by+c,其中a,b,c为常数,等式右边是通常的加法与乘法运算,已知3*

Answer 1

3a + 5b + c = 15

4a + 7b + c = 28

所以：a = -35 - 2c

b = 24 + c

1*1 = -35 - 2c + 24 + c + c = -11