SAT数学题，请帮忙翻译。the operation given by (a,b)# (c,d)=(a+bc, bd) is defined on the set of ordered pairs with nonzero second elements. Which of the following is the identity element for this operation?
2020-02-24
SAT数学题，请帮忙翻译。
the operation given by (a,b)# (c,d)=(a+bc, bd) is defined on the set of ordered pairs with nonzero second elements. Which of the following is the identity element for this operation?