Chữ mình không được đẹp lắm, bạn thông cảm
Xin hay nhất ạ
`x^2-7x+12=0`
`<=>x^2-4x-3x+12=0`
`<=>(x^2-4x)-(3x-12)=0`
`<=>x(x-4)-3(x-4)=0`
`<=>(x-3)(x-4)=0`
`<=>[(x-3=0),(x-4=0):}`
`<=>[(x=3),(x=4):}`
Vậy `x=3` hoặc `x=4`
Rewrite …, using “such ……. that" 1. We watched an exciting competition. We didn't want to go home. -> We .. 2. The show was excellent. We all enjoyed it. -> It … 3. Those lessons are very difficult. He can't understand them. -> They… 4. She was very busy. She couldn't do the housework. -> She ....... 5. The weather is very bad. We can’t go for a walk. -> It ........ 6. He is very talkative. He is always talking in the class -> He … 7. That boy is very lazy. He never does his homework. -> He … 8. The film is very boring. The children can’t watch it all. -> It …
Làm giúp em mấy câu này ạ, chỉ làm phần có đánh dấu X thui:<
(x-1)-(2x-1)=x+4 3x(x-2)+4(x-2)=0
Giúp mình 1a với ạ.Mình cảm ơn trước :))))
Cho hình vẽ, hãy chứng minh AB//CD
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