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oanhtuyetlenguyen2510
2 năm trước
Phương trình nào dưới đây là phương trình bậc nhất hai ẩn? A. xy + x= 3 В. 2х - у =0 C. x + y = xy D. x^2 + y = 7. Giải giúp em câu 1 ạ :<
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Read the text, and identify whether the statements are true (T), or false (F). Vietnamese food culture varies by regions from the north to the south. In Northern Viet Nam, Vietnamese food is characterized by light and balanced flavours with the combination of many ingredients. Northerners have been using many kinds of meats like pork, beef, and chicken to cook; besides, some kinds of freshwater fish, crustaceans, and other mollusks like shrimps, crabs, and oysters, etc. Many famous dishes of Viet Nam are cooked with these ingredients such as Bun Rieu, Pho, Bun Thang, Bun Cha, Banh Cuon, etc. Then, food culture in Central and Southern Viet Nam has developed suitable flavors in each region. In Central Viet Nam, the regional cuisine of Central Viet Nam is famous for its spicy food, which differs from two other parts with mostly non-spicy food. Hue cuisine is typical Central Viet Nam’s food culture. Dishes of Hue cuisine are decorative and colorful, which expresses the influence of the Vietnamese royal cuisine in the feudal period. Food in the region is often decorated sophisticatedly and used with chili peppers and shrimp sauces, manely, Bun Bo Hue, Banh xeo, or Banh beo, etc. In Southern Viet Nam, the region is characterized by warm weather and fertile soil, which creates favorable conditions for planting a variety of fruit, vegetables and live stock. Thus, food in the region is often added with garlic, shallots and fresh herbs. Particularly, Southerners are favored of sugar; they add sugar in most dishes. Here, there is also an influence of western and Asian cuisines on southern food, such as influences from China, India, France, and Thailand. T F 1. Vietnamese food is rich in flavours and ingredients. 2. Vietnamese food cuisine differs from region to region. 3. Dishes in the north are often spicy with shrimps, crabs, and oysters. 4. Hue cuisine reflects the Vietnamese royal cuisine. 5. Hue dishes used to be decorated sophisticatedly in the feudal period. 6. We can easily see the Western-style food in Central Viet Nam. 7. Maybe people from other regions feel that southern dishes are sweet. 8. Food in Central Viet Nam is used with garlic, shallots and fresh herbs.

Bài 1: Tính hợp lí 1/(-37) + 14 + 26 + 37 2/(-24) + 6 + 10 + 24 3/15 + 23 + (-25) + (-23) 4/60 + 33 + (-50) + (-33) 5/(-16) + (-209) + (-14) + 209 6/(-12) + (-13) + 36 + (-11) 7/-16 + 24 + 16 – 34 8/25 + 37 – 48 – 25 – 37 9/2575 + 37 – 2576 – 29 10/34 + 35 + 36 + 37 – 14 – 15 – 16 – 17 Bài 2: Bỏ dấu ngoặc 1/-7264 + (1543 + 7264) 2/(144 – 97) – 144 3/(-145) – (18 – 145) 4/111 + (-11 + 27) 5/(27 + 514) – (486 – 73) 6/(36 + 79) + (145 – 79 – 36) 7/10 – [12 – (- 9 - 1)] 8/(38 – 29 + 43) – (43 + 38) 9/271 – [(-43) + 271 – (-17)] 10/-144 – [29 – (+144) – (+144)] Bài 3: Tính tổng các số nguyên biết: 1/-20 < x < 21 2/-18 ≤ x ≤ 17 3/-27 < x ≤ 27 4/│x│≤ 3 5/ │-x│< 5 Bài 4: Tính tổng 1/1 + (-2) + 3 + (-4) + . . . + 19 + (-20) 2/1 – 2 + 3 – 4 + . . . + 99 – 100 3/2 – 4 + 6 – 8 + . . . + 48 – 50 4/– 1 + 3 – 5 + 7 - . . . . + 97 – 99 5/1 + 2 – 3 – 4 + . . . . + 97 + 98 – 99 - 100 Bài 5: Tính giá trị biểu thức 1/x + 8 – x – 22 với x = 2010 2/- x – a + 12 + a với x = - 98; a = 99 3/a – m + 7 – 8 + m với a = 1; m = - 123 4/ (-90) – (y + 10) + 100 với p = -24 Bài 6: Tìm x 1/-16 + 23 + x = - 16 2/2x – 35 = 15 3/3x + 17 = 12 4/│x - 1│= 0 5/-13 .│x│ = -26 Bài 7: Tính hợp lí 1/35. 18 – 5. 7. 28 2/45 – 5. (12 + 9) 3/24. (16 – 5) – 16. (24 - 5) 4/29. (19 – 13) – 19. (29 – 13) 5/31. (-18) + 31. ( - 81) – 31 6/(-12).47 + (-12). 52 + (-12) 7/13.(23 + 22) – 3.(17 + 28) 8/-48 + 48. (-78) + 48.(-21) Bài 8: Tính 1/(-6 – 2). (-6 + 2) 2/(7. 3 – 3) : (-6) 3/(-5 + 9) . (-4) 4/72 : (-6. 2 + 4) 5/-3. 7 – 4. (-5) + 1 6/18 – 10 : (+2) – 7 7/15 : (-5).(-3) – 8 8/(6. 8 – 10 : 5) + 3. (-7) Bài 9: So sánh 1/(-99). 98 . (-97) với 0 2/(-5)(-4)(-3)(-2)(-1) với 0 3/(-245)(-47)(-199) với 123.(+315) 4/2987. (-1974). (+243). 0 với 0 5/(-12).(-45) : (-27) với│-1│ Bài 10: Tính giá trị biểu thức 1/(-25). ( -3). x với x = 4 2/(-1). (-4) . 5 . 8 . y với y = 25 3/(2ab2) : c với a = 4; b = -6; c = 12 4/[(-25).(-27).(-x)] : y với x = 4; y = -9 5/(a2 - b2) : (a + b) (a – b) với a = 5 ; b = -3 Bài 11: Điền vào ô trống a -3 +8 0 -(-1) - a -2 +7 │a│ a2 Bài 12: Điền số vào ô trống A -6 +15 10 B 3 -2 -9 a + b -10 -1 a – b 15 a . b 0 -12 a : b -3 Bài 13: Tìm x 1/(2x – 5) + 17 = 6 2/10 – 2(4 – 3x) = -4 3/- 12 + 3(-x + 7) = -18 4/24 : (3x – 2) = -3 5/-45 : 5.(-3 – 2x) = 3 Bài 14: Tìm x 1/x.(x + 7) = 0 2/(x + 12).(x-3) = 0 3/(-x + 5).(3 – x ) = 0 4/x.(2 + x).( 7 – x) = 0 5/(x - 1).(x +2).(-x -3) = 0 Bài 15: Tìm 1/Ư(10) và B(10) 2/Ư(-15) và B(15) 3/Ư(-24) và B(-24) 4/ƯC(12; 18) 5/ƯC(-15; 20) Bài 16: Tìm x biết 1/8 x và x > 0 2/12 x và x < 0 3/-8 x và 12 x 4/x 4 ; x (-6) và -20 < x < -10 5/x (-9) ; x (+12) và 20 < x < 50 Bài 17: Đưa về dạng tích 1/ab + ac 2/ab – ac + ad 3/ax – bx – cx + dx 4/a(b + c) – d(b + c) 5/ac – ad + bc – bd 6/ax + by + bx + ay Bài 18: Chứng tỏ 1/(a – b + c) – (a + c) = -b 2/ (a + b) – (b – a) + c = 2a + c 3/- (a + b – c) + (a – b – c) = -2b 4/a(b + c) – a(b + d) = a(c – d) 5/a(b – c) + a(d + c) = a(b + d) Bài 19: Tìm a biết 1/a + b – c = 18 với b = 10 ; c = -9 2/2a – 3b + c = 0 với b = -2 ; c = 4 3/3a – b – 2c = 2 với b = 6 ; c = -1 4/12 – a + b + 5c = -1 với b = -7 ; c = 5 5/1 – 2b + c – 3a = -9 với b = -3 ; c = -7 Bài 20: Sắp xếp theo thứ tự * Tăng dần 1/7; -12 ; +4 ; 0 ; │-8│; -10; -1 2/-12; │+4│; -5 ; -3 ; +3 ; 0 ; │-5│ * Giảm dần 3/+9 ; -4 ; │-6│; 0 ; -│-5│; -(-12) 4/-(-3) ; -(+2) ; │-1│; 0 ; +(-5) ; 4 ; │+7│; -8 Bài 21: Tìm số nguyên n sao cho n + 2 chia hết cho n – 3

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