Tính tổng sau:
149-148+147-146+...+3-2
Những câu hỏi liên quan
149-148+147-146+...+3-2
= (149-148)+(147-146)+..........+(3-2)
= 1+1+..........+1
74 số
= 1.74
= 74
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146. A famous artisian carved this table ___ (BEAUTY)147. When they talk about ___ paintings, they think of Dong Ho Village.( TRADITION)148. The ___ are trying to learn English. They can communicate with foreign customers. (VILLAGE)149. The department store is an ___ in my city. (ATTRACT)150. Where did you get the ___ about Disneyland resort ? (INFORM)151. I’ll read this leaflet to see what ____ are organized at this attraction. (ACT)152. They’re going to publish a guidebook to ___ beauty spots...
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146. A famous artisian carved this table ___ (BEAUTY)
147. When they talk about ___ paintings, they think of Dong Ho Village.( TRADITION)
148. The ___ are trying to learn English. They can communicate with foreign customers. (VILLAGE)
149. The department store is an ___ in my city. (ATTRACT)
150. Where did you get the ___ about Disneyland resort ? (INFORM)
151. I’ll read this leaflet to see what ____ are organized at this attraction. (ACT)
152. They’re going to publish a guidebook to ___ beauty spots in Vietnam. (DIFFER)
153. I’m thinking with ___ about the weekend. (PLEASE)
154. Craftsmen must be ___ to make the two layer very thin. (SKILL)
155. Hoa loves nature and ___ (QUIET)
146. beautifully
147. traditional
148. villagers
149. attraction
150. information
151. activities
152. different
153. pleasure
154. skillful
155. quietness
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146. Beautifully
147. Traditional
148. Villagers
149. Attraction
150. Information
151. Activities
152. Different
153. Pleasure
154. Skilled
155. Quiteness
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\(B=150^2-149^2+148^2-147^2+\cdot\cdot\cdot+2^2-1^2\)
TÍNH
giúp với
B=150^2-149^2+148^2-147^2+...+2^2-1
=(150-149)(150+149)+(148-147)(148+147)+...+(2-1)(2+1)
=299+295+...+3
số số hạng (299-3):4+1=75
tổng là [(299+3).75]:2=11325
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Công thức [a2-(a-1)2]=(a-a+1)(a+a-1)=[a+(a-1)]
có công thức thế vào làm thử ik
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Cho : S = 150 * 149 * 148 * 147 * ... * 51 * 50
Điền dấu " + " hoặc " - " vào dấu *. Giải thích tổng ( hiệu ) của S có thể bằng 2011 không ?
Bài 146:|x-11|+x-1
Bài 147:|x-11|+11-x
Bài:148:4x+5-|x+3|=11 với x nhỏ hơn hoặc bằng-3
ai đổi ko zậy
____________
____________
ik
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1 tháng 11 2021 lúc 12:14
Điền vào chỗ trống dạng đúng của từ cho sẵn: tính từ đuôi ING hoặc ED146+147. Ted forgets to close his zipper (khóa quần). It is __________________________. Ted feels ________________________ (EMBARRASS)148+149. Michael Phelps is ______________________. Michael Phelps Olympic win is _______________________. (EXCITE)150+151. How to get the cheese is __________________________. The mouse is ___________________________. (CONFUSE)152+153. The taste is ______________________. I am ___________________...
Đọc tiếp
Điền vào chỗ trống dạng đúng của từ cho sẵn: tính từ đuôi ING hoặc ED
146+147. Ted forgets to close his zipper (khóa quần). It is __________________________. Ted feels ________________________ (EMBARRASS)
148+149. Michael Phelps is ______________________. Michael Phelps' Olympic win is _______________________. (EXCITE)
150+151. How to get the cheese is __________________________. The mouse is ___________________________. (CONFUSE)
152+153. The taste is ______________________. I am ________________________.(SATISFY)
154+155. It is an _______________________ game. It makes us_________________________.(EXCITE)
156+157. She hears ______________________ news. She is so ____________________ that she couldn’t say anything. (SURPRISE)
158+159. I have a ___________________ job, so my mother always says that I look___________________at the end of the day. (TIRE)
160+161. Everyone's very ____________________ about the news because it is such _____________________ news (EXCITE)
162+163. That lamp produces a very _____________________ effect (hiệu ứng), I am very ____________________to buy this. (PLEASE)
164+165. I don't like watching ____________________ films on my own, the actress is always ____________________
(DEPRESS)
166. I am ______________________ when she told me she will divorce (ly hôn). (AMAZE)
Cấu trúc: -ed: cảm xúc của ng (vd: I'm very excited about our trip to Ha Long Bay);
-ing: miêu tả tính chất, đặc điểm của ng, vật, hiện tg (vd: The trip to Ha Long Bay is very exciting)
146+147. Ted forgets to close his zipper (khóa quần). It is __embarrassing____. Ted feels __embarressed______ (EMBARRASS)
148+149. Michael Phelps is ____excited____. Michael Phelps' Olympic win is ___exciting____. (EXCITE)
150+151. How to get the cheese is ___confusing_____. The mouse is _______confused______. (CONFUSE)
152+153. The taste is ___satisfying_______. I am ___satisfied__.(SATISFY)
154+155. It is an ____exciting______ game. It makes us______excited______.(EXCITE)
156+157. She hears ___surprising____ news. She is so ___surprised___ that she couldn’t say anything. (SURPRISE)
158+159. I have a ______tiring___ job, so my mother always says that I look__tired____at the end of the day. (TIRE)
160+161. Everyone's very ____excited____ about the news because it is such ___ exciting______ news (EXCITE)
162+163. That lamp produces a very ____pleasing___ effect (hiệu ứng), I am very ____pleased____to buy this. (PLEASE)
164+165. I don't like watching __depressing__ films on my own, the actress is always _____depressed___
(DEPRESS)
166. I am __amazed_____ when she told me she will divorce (ly hôn). (AMAZE)
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x+143/157+x+146/154=x+149/151+x+152/148 Các bạn giúp mình với!!
\(\frac{x+143}{157}+\frac{x+146}{154}=\frac{x+149}{151}+\frac{x+152}{148}\)
\(\Leftrightarrow\frac{x+143}{157}+1+\frac{x+146}{154}+1=\frac{x+149}{151}+1+\frac{x+152}{148}+1\)
\(\Leftrightarrow\frac{x+300}{157}+\frac{x+300}{154}=\frac{x+300}{151}+\frac{x+300}{148}\)
\(\Leftrightarrow\left(x+300\right)\left(\frac{1}{157}+\frac{1}{154}-\frac{1}{151}-\frac{1}{148}\right)=0\)
có \(\frac{1}{157}+\frac{1}{154}+\frac{1}{151}+\frac{1}{148}\ne0\)
\(\Leftrightarrow x+300=0\)
\(\Leftrightarrow x=-300\)
Tính tổng: 16+20+24+....+146+148
Có số số hạng là :( 148 - 16 ) : 4 + 1 = 34 ( số )
Tổng trên là :( 148 + 16 ) x 34 : 2 = 2788
Đ/S : 2788
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Tính: 1 – 2 + 3 – 4 + … + 145 – 146 + 147 = …
= (1-2) + ( 3 -4 ) + ..... + ( 145 - 146 ) + 147
= -1 + -1 + .... + -1 + 147
rồi bn tự áp dụng công thức :
\(SSH=\left(\right)SC-SĐ\left(\right):KHOẢNGCÁCH+1\)
Tổng = ( SĐ + SC) X SSH : 2
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