9! - 8! - 7! . 82
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\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
\(=\left(100+121+144\right):\left(169+196\right)\)
\(=365:365=1\)
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Lời giải:
Trung bình cộng của 2 số: $9876$
Tổng của hai số: $9876\times 2=19752$
Một trong hai số là: $1230$
Số còn lại là; $19752-1230=18522$
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\(\left(37+18\right).\left\{3250-15^2.\left[\left(4^4-2^5\right):16\right]\right\}\)
\(=55.\left\{3250-225.\left[\left(256-32\right):16\right]\right\}\)
\(=55.\left\{3250-225.14\right\}\)
\(=55.\left\{3250-3150\right\}=55.100=5500\)
( 37 + 18 ) . { 3250 - 152 . [ 44 - 25 ) : 16 ] }
= 55 . { 3250 - 225 . ( 256 - 32 ) : 16 ] }
= 55 . { 3250 - 225 . 224 : 16 }
= 55 . { 3250 - 3150 }
= 55 . 100
= 5500.
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\(\left[400-\left(40:2^3+3.5^3\right)\right]:5\)
\(=\left[400-\left(40:8+3.125\right)\right]:5\)
\(=\left[400-\left(5+375\right)\right]:5\)
\(=\left[400-380\right]:5=20:5=4\)
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Số trang sách còn lại sau 2 ngày đầu là:
30 : 20% = 150 (trang)
Số trang sách còn lại sau ngày đầu là:
150 : 40% = 375 (trang)
Số trang sách ban đầu của cuốn sách là:
375 : 60% = 625 (trang)
Vậy cuốn sách có 625 trang.
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- "I'll come and see you as soon as I can," he/she said.
- My teacher said, "You should practice speaking English everyday."
- She told her son, "Go straight upstairs and get into bed."
- The lifeguard said, "Don't swim out too far, boys."
- He asked Huong, "Could you give me a hand, please?"
- The traffic police said, "Show me your driving license, please."
- Nien asked Hoa, "Do you have many new friends?"
- They told us, "You must go now."
- I asked Nam, "Are you free tonight?"
- The visitors asked, "Can we take photos?"
- She asked, "Do you know the way to the station?"
- "Will I finish my exercise at home?" he/she asked.
- She asked Minh, "Can you speak Chinese?"
- The girl asked, "How old is your grandparent?"
- They asked, "Who are you going with tomorrow?"
- I asked Tam, "Do you want to visit the Great Wall in China?"
- I asked the tourist, "Are you from Canada?"
- I told Lan, "Send me a postcard when you arrive in Paris."
- Thu asked Hoa, "Why is she crying?"
- Mrs. Ly asked, "When do your children go swimming?"
- "I'll come and see you as soon as I can," he/she said.
- My teacher said, "You should practice speaking English everyday."
- She told her son, "Go straight upstairs and get into bed."
- The lifeguard said, "Don't swim out too far, boys."
- He asked Huong, "Could you give me a hand, please?"
- The traffic police said, "Show me your driving license, please."
- Nien asked Hoa, "Do you have many new friends?"
- They told us, "You must go now."
- I asked Nam, "Are you free tonight?"
- The visitors asked, "Can we take photos?"
- She asked, "Do you know the way to the station?"
- "Will I finish my exercise at home?" he/she asked.
- She asked Minh, "Can you speak Chinese?"
- The girl asked, "How old is your grandparent?"
- They asked, "Who are you going with tomorrow?"
- I asked Tam, "Do you want to visit the Great Wall in China?"
- I asked the tourist, "Are you from Canada?"
- I told Lan, "Send me a postcard when you arrive in Paris."
- Thu asked Hoa, "Why is she crying?"
- Mrs. Ly asked, "When do your children go swimming?"
\(9!-8!-7!.8^2=9!-8!-8!.8=8!\left(9-1-8\right)=8!.0=0\)