Đáp án+Giải thích các bước giải:
`Ta\ có: x+y+x=0`$\\$`=>(x+y+z)^2=0`$\\$`=>x^2+y^2+z^2+2.(xy+xz+yz)=0`$\\$`=>x^2+y^2+z^2+2.0=0`$\\$`=>x^2+y^2+z^2=0`$\\$`Vì,{(x^2>=0),(y^2>=0),(z>=0):}`$\\$`Để, x^2+y^2+z^2=0`$\\$`Thì, x=y=z=0`
Giúp em với ạ! Em cảm ơn mọi người nhiều lắm :333
giúp mik với ạ . mik sẽ vote đủ ạ
Hi mng , giúp mình vs ạ , gấp ạ
Complete each of the following sentences in such a way that it means the same as the sentence printed before it. 1.They will open a new school here next year. A new school ……………………….. 2. She can’t go to work today because she is tired. If …………………………….. 3. Please let me open the window. Would you mind ………………………..? 4. “Why don’t we go and have a look at the cathedral?” He suggested…………………………. 5. The last time we met each other was ten years ago. We haven’t ………………….. 6. Leave now or we will miss the train. Unless ……………………………. 7.You backpack is not the same as mine. => My backpack ............................ 9.How long have you studied medicine? - When …………………….? 10. They bought this building two years ago. This building …………………..
Phương trình: sin(2x-π/3)=√3/2 có nghiệm thuộc khoảng (0:3π) là bao nhiêu? Giúp em với mng ơi..em cần gấp ạ.
giúp mình với ạ! đề bài : rút gọn biểu thức
Các bn lm cho mk vài này vs! Và thêm 1 câu là: 1.She doesn't play...............well...........her sister.
Cho dãy số : 1;3;5;7;.... Dãy dùng 695 chữ số. Tìm số hạng cuối cùng của dãy.
VI. Complete the sentences with the phrasal verbs from the box. 1. Sue was offered a job as a translator but she it . 2. His shoes are quite . He’ll have to get a new pair. 3. They have had to the football match because of snow. 4. Rachel knew that Ross would be worried if she didn’t . 5. Can you imagine who I while I was in Paris? 6. An investigation was by the local police. 7. A house in our neighborhood was last night. 8. He’s been feeling much better since he smoking. 9. She her clothes and got into bed. 10. Zedco wants to a new sales office in Germany. call off set up turned down gave up turn up carried out worn out came across took off broken into
Mn giúp mk nhé đang cần gấp trong hôm nay
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến