Đáp án+Giải thích các bước giải:
`c)` `(x+y-1)^2-2(x+y-1)(x+y)+(x+y)^2`
`=[(x+y-1)-(x+y)]^2`
`=(x+y-1-x-y)^2`
`=(-1)^2`
`=1`
Áp dụng HĐT số `2:` `A^2-2AB+B^2=(A-B)^2`
Đáp án + Giải thích các bước giải:
`c) (x + y - 1)^2 - 2(x + y - 1)(x + y) + (x + y)^2`
`= [(x + y - 1) - (x + y)]^2`
`= (x + y - 1 - x - y)^2`
`= (-1)^2`
`= 1`
Áp dụng: `(A - B)^2 = A^2 - 2AB + B^2`
Dựa vào những từ sau viết câu hoàn chỉnh về chủ đề Whether parents help their children with social networks Giúp 4 câu tiếp 5. Other/ receive/ online advertising/ that/ be/ inappropriate for their age. 6. It/ be/ important/ parents/ be/ aware of/ what/ children/ doing online. 7. Parents/ make/ children/ understand that/ they/ respect/ children’s privacy. 8. However/ parents/ want/ make sure/ children/ be safe.
làm bài .....................................................
giúp vs mọi người ơi em cần gấp nha
Bat Trang traditional craft village of Hanoi is a tourist attraction for both domestic and foreign tourists. Stores at Bat Trang show products in (I) ______ shapes and styles. Made by family companies, the price here is quite reasonable. A lot of people from surrounding regions and abroad (II) ______ here to buy their favorite ceramic products. (III) ______ daily items such as pots, cups, plates, stores sell a wide range of goods such as interior decorations, worship items, etc. Ceramic pictures are selected by many customers. You can buy souvenirs like necklaces, key chains, piggy banks to give to your relatives and friends. (IV) ______ the ceramic village, tourists are able to take part in many entertainment activities such as riding buffalo vehicles to visit the village. Tourists cannot miss out on making a (V) ______ ceramic gift. You will be provided a rotating table and a tray of clay. Shopkeepers will guide you in how to create a ceramic product. Finally, you can feel free to shape your product. (Adapted from http://english.vietnamnet.vn/) Câu 31. (Blank I) A different B differently C difference D differ Câu 32. (Blank II) A come B comes C had come D came Câu 33. (Blank III) A Therefore B Except for C Apart from D However Câu 34. (Blank IV) A Visit B To visit C Visited D Visiting Câu 35. (Blank V) A ready-made B handmade C homemade D man-made
Chữ A này đúng với calli chưa mụi ng
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giúp mik gấp nhé câu màu đỏ phải ghi PTHH
Cho tam giác ABC cân tại A, BC=12 cm, chiều cao AH=4cm.Tính bán kính đường tròn ngoại tiếp tam giác này.
làm bài 8 từ câu 5 - 10.....................................................
Dựa vào những từ sau viết câu hoàn chỉnh về chủ đề Whether parents help their children with social networks Giúp 4 câu 1. There/ both/ many good things/ many potential dangers/ social network. 2. It/ important for parents/ teach/ their children/ how/ use/ social media wisely. 3. Social network/ be/ start of bad things/ like cyber bullying. 4. Recent reports/ say/ many teenagers/ have/ online contact/ strangers/ and/ it/ make/ them/ feel scared or uncomfortable.
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