2x-7<3(1-x) ①4x+9≥3-2x ②,
由①得:x<2,
由②得:x≥-1,
不等式组的解集为-1≤x<2.
--- I really don’t know how ________ this problem.
--- Let me see.
A.to do with
B.to deal with
C.doing with
D.dealing with
下列最新的地质年代是( )。
A.奥陶纪
B.三叠纪
C.泥盆纪
D.白垩纪