Đáp án + Giải thích các bước giải:
`a, \ (xy-x+y-1)/(x^2y+xy-x-1)`
`=(x(y-1)+(y-1))/(xy(x+1)-(x+1))=((x+1)(y-1))/((xy-1)(x+1))`
`=(y-1)/(xy-1)`
`b, \ (x^2+y^2-z^2+2xy)/(x^2+z^2-y^2-2zx)`
`=((x^2+2xy+y^2)-z^2)/((x^2-2zx+z^2)-y^2)`
`=((x+y)^2-z^2)/((x-z)^2-y^2)=((x+y-z)(x+y+z))/((x-z-y)(x-z+y))`
`=(x+y+z)/(x-z-y)`
a)
$=\frac{x(y-1)+y-1}{xy(x+1)-(x+1)}$
$=\frac{(y-1)(x+1)}{(x+1)(xy-1)}$
$=\frac{y-1}{xy-1}$
b)
$=\frac{(x+y)^2-z^2}{x^2+z^2-y^2-2xz}$
$=\frac{(x+y-z)(x+y+z)}{(x-z)^2-y^2}$
$=\frac{(x+y-z)(x+y+z)}{(x-z-y)(x-z+y)}$
$=\frac{x+y+z}{x-z-y}$
UNIT 1 LOCAL ENVIRONMENT Exercise 1 Choose the best answer Question 1: Tom works as a/ an .................... in his aunt’s workshop. A. handicraft B. artisan C. embroider D. employer Question 2: Vietnamese .................... is now available to purchase online. A. lacquer B. lacquers C. lacquerware D. craftsman Question 3: Those handicrafts may face the challenges of losing their .................... A. craft B. sculpture C. authenticity D. price Question 4: How many .................... of leaves does a Hue’s conical hat have? A. surface B. layers C. frames D. color Question 5: I know some interesting tourist ............. in the city that you would love to visit. A. sculptures B. attractive C. handicrafts D. attractions Question 6: The car has been .................... in clay. A.moulded B. woven C. embroidered D. casted Question 7: The scarf embroidered with gold .................... is the most expensive one in our shop. A. frame B. layer C. thread D. paper Question 8: The artists in my village usually change the design of their products _______ more customers. A. to attracting B. to be attractive C. to attract D. attracting Question 9: Van Phuc village in Ha Noi ________ different types of silk products such as cloth, ties, dresses, shirts, and scarves. A.product B. produces C. producing D. will produce Question 10: These products are called lacquerware because they are decoratively ________with lacquer. A.cover B. covered C. covers D. covering Ex 2 Complete the following sentences using appropriate subordinating conjunctions. 1. I often visit my relatives …………………. I have free time. (If/ whenever/ while/ unless) 2. This is the place that I used to stay ……I was studying in New York. (when/ if/ because/ so) 3. ……… you get the first rank, I will buy you a car. (Although/ unless / because / if) 4. ……. you work hard, you can’t pass the entrance test. (when/ so that / because / unless) 5. I am leaving tomorrow …… I will have an important interview this weekend. (Even though/ unless / because / if) 6. He could not get a seat, ………… he came early. (though/ so that / because / if) 7. They delivered an impressive performance ……they had rehearsed well. (though/ as / because of/ when) 8. Parents should give enough attention to children ……they will not feel neglected. (even though/ so that / because / when) Bạn Nào làm đc làm hộ mik cái nếu ko bt thì đừng làm sai nhá xin cảm ơn
Em hãy tả một vài cảnh vật trong bức tranh
các anh chị giải hộ em với ạ . em cảm mơn
calli: chịu có trang trí Nl: nhóm gì mà hở tí lại chửi thì chịu .-.
Mọi ng giúp mình vs ạ, mình đang gấp🐇
tìm hiểu hộ mình về ảnh 13 trang 19 sách lịch sử lớp 7 ạ , mình cần gấp vì muộn r
Calli: Nó mệt rồi, đừng làm phiền nó ^^
mình đang cần gấp các bạn giải giúp mình nha mình hứa sẽ vote cho 5 sao
Giúp mình v nha mình cần rất gấp
Giúp mik với, viết ra giấy hộ mik
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
