X²              = 20x -100

tìm x ạ 

15. Don’t put the box there. - Put it _________.

A. near B. here C. that D. nearby

12. It’s raining _________. Let’s go.

A. inside B. outside C. insides D. outsides

cho tứ giác ABCD , góc A = 50^o, góc B = 70^o,góc C > góc D 62^o . Tính góc C, D