题目

我们规定一种运算： =ad﹣bc，例如 =3×6﹣4×5=﹣2.按照这种运算规定，已知 =0，则 . 答案：【1】−52Where _______he_________? Do you know?A.is; come from B.do; come from C.does; come from D.does; comes from