1) tìm m để hệ phương trình sau vô nghiệm {x-y=1;mx+y=m-2

1) tìm m để các hệ phương trình sau có nghiệm duy nhất a)(2m-1)x+y=5 ; 3x-y=m , b)x+y=1 ; mx-y=m+2

1) tìm m để hệ phương trình sau vô nghiệm {x-y=1;mx+y=m-2

3.” I must go home to make the dinner”, said Mary. ( Mary................................................................................................. 4. “ Are you going to Ho Chi Minh City next week?” Tom asked me. ( Tom asked..................................................................................... 5. “ Have you finished your homework?” Mom asked. ( Mom asked ........................................................................................ 6.She said to me “ I can’t do it by myself”. ( She told me that............................................................................ 7.”Does your brother live in London, Nam?” Lan asked. (Lan wanted to know if................................................................. 8.”Don’t repeat this mistake again.” his father warned him. (His father warned him.................................................................... 9.”Give me a smile,” The photographer said to me. (The.................................................................................................. 10.”Don’t leave these book on the table” ,the librarian said to the students (The librarian told the

3.” I must go home to make the dinner”, said Mary. ( Mary................................................................................................. 4. “ Are you going to Ho Chi Minh City next week?” Tom asked me. ( Tom asked..................................................................................... 5. “ Have you finished your homework?” Mom asked. ( Mom asked ........................................................................................ 6.She said to me “ I can’t do it by myself”. ( She told me that............................................................................ 7.”Does your brother live in London, Nam?” Lan asked. (Lan wanted to know if................................................................. 8.”Don’t repeat this mistake again.” his father warned him. (His father warned him.................................................................... 9.”Give me a smile,” The photographer said to me. (The.................................................................................................. 10.”Don’t leave these book on the table” ,the librarian said to the students (The librarian told the

1) tìm nghiệm nguyên của phương trình.. a) 18 x - 30y = 59; b) 22 x - 5 y = 77; c) 12x+ 19 y = 94

1) tìm nghiệm nguyên của phương trình.. a) 18 x - 30y = 59; b) 22 x - 5 y = 77; c) 12x+ 19 y = 94

1) cho đường thẳng (d):3x+ 4y - 12 = 0.Đường thẳng (d) cắt ox tại A, oy tại B.Tính diện tích tam giác OAB

1) cho đường thẳng (d):3x+ 4y - 12 = 0.Đường thẳng (d) cắt ox tại A, oy tại B.Tính diện tích tam giác OAB