题型:问答题 They happen to be of age ,and they all go in for American football.A.the same ;the B.不填;不填C.an;不填D.an;the 查看答案
题型:问答题 解方程(组):(1)3x+52=2x-13; (2)3y-14-1=5y-76;(3)2x-y=5, ①3x+4y=2, ②; (4)3(x-1)=4(y-4)5(y-1)=3(x+5). 查看答案