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hatrang1912
2 năm trước
Tìm GTNN của: A=x ²-10x+30 B=25x ²+20-7 C=x ²-2x+y ²+z ²-4y-6z D=(x-1) (x-2) (x-3) (x-4)-48 E= x ²+2y ²-2xy-y+1
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Các câu hỏi liên quan

1. She _______ a hamburger. (not eat) 2. They__________ pictures at 3 p.m yesterday. (paint) 3. The teacher____________ the door when the students came. (open) 4. John________________ his bike this afternoon. (not ride) 5. We______________ on the Computer at 2 p.m. (not work) 6. Doris__________ the news on TV when I saw him. (watch) 7. I_________________ the piano. (not practice) 8. My friends______________songs (not sing) 9. Steve__________ a cigarette at 5 yesterday afternoon. (smoke) 10. Sam and Liz__________ for their friends. (not look) 1. They_______________ the lunch basket. (pack) 2. I __________ somebody the way. (not ask) 3. Rita_______________ Jim’s book. (borrow) 4. We__________ a T-shirt. (not design) 5. I __________ on the red button. (click) 6. The girls__________ the boys. (not help) 7. Tim________________ Sandra’s hair. (cut) 8. Andy and Fred __________a song, (not sing) 9. You________________ (prepare) 10. He__________ the chicken in the garden. (not keep)

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