Bài 1. Tìm x thuộc Z sao cho (x^2-7).(x^2-51)<0 Bài 2. Tìm x;y thuộc Z biết: 3.x+4.y-x.y=15 (các bn giúp mk vs,mk đang cần gấp,giải thích luôn hộ mk ak, mk cảm ơn)

Các câu hỏi liên quan

V, Dựa vào từ gợi ý đặt câu : 1, There / be / green trees / beautiful flowers / park . ................................................................................................................................................................................... 2, What / be / dress ? --- It / be / purple. ................................................................................................................................................................................... 3, George / have / pink / gray / erasers / two red pencils . ................................................................................................................................................................................... 4, Children / play / volleyball / now . ................................................................................................................................................................................... 5, Mrs. Young / often / travel / work / motorbike . ................................................................................................................................................................................... 6, she / not have / time / write / friends. ................................................................................................................................................................................... 7, Your / mother / ever / travel / work / bus ? ................................................................................................................................................................................... 8, Hoa / sister / listen / music / room / the moment . ................................................................................................................................................................................... 9, brother / live / Paris / and / have / bakery / there ................................................................................................................................................................................. 10, Miss Thuy / wash / hair / because / go / party / there ................................................................................................................................................................................