K
Khách
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DT
1 tháng 4 2017
40 quyển sách tương ứng số phần là: 4/5-4/15=8/15( quyển sách)
Thư viện có số sách là: 40:8/15 =75 ( quyển sách)
Số sách toán là : 75. 4/5= 60 ( quyển sách)
Số sách văn là : 75-60 = 15 quyển sách
KN
21 tháng 2 2021
câu trả lời:
40 quyển sách tương ứng số phần là: 4/5-4/15=8/15( quyển sách)
Thư viện có số sách là: 40:8/15 =75 ( quyển sách)
Số sách toán là : 75. 4/5= 60 ( quyển sách)
Số sách văn là : 75-60 = 15 quyển sách
TM
27 tháng 12 2016
Đặt \(\frac{x}{a}=\frac{y}{b}=\frac{z}{c}=k\Rightarrow\hept{\begin{cases}x=ak\\y=bk\\z=ck\end{cases}}\)
=>\(B=\frac{\left(a^2x+b^2y+c^2z\right)^3}{x^3+y^3+z^3}=\frac{\left(a^2ak+b^2bk+c^2ck\right)^3}{\left(ak\right)^3+\left(bk\right)^3+\left(ck\right)^3}=\frac{\left(a^3k+b^3k+c^3k\right)^3}{a^3k^3+b^3k^3+c^3k^3}\)
\(=\frac{k^3\left(a^3+b^3+c^3\right)^3}{k^3\left(a^3+b^3+c^3\right)}=\left(a^3+b^3+c^3\right)^2\)
28 tháng 12 2016
cảm ơn trà my nhiều
bài nè ko phải gửi đi lấy điểm đâu các bn.
NV
1
NL
Nguyễn Lê Phước Thịnh
CTVHS
14 tháng 9 2025
a: \(5\cdot6\cdot7\) ⋮3
\(8\cdot9\) ⋮3
Do đó: \(5\cdot6\cdot7+8\cdot9\) ⋮3
=>Đây là hợp số
b: \(7\cdot11\cdot13\) ⋮7
\(2\cdot5\cdot7\) ⋮7
Do đó: \(7\cdot11\cdot13-2\cdot5\cdot7\) ⋮7
=>Đây là hợp số
c: \(5\cdot11\cdot13\) là số lẻ
\(17\cdot19\cdot23\) là số lẻ
Do đó: \(5\cdot11\cdot13+17\cdot19\cdot23\) là số chẵn
mà \(5\cdot11\cdot13+17\cdot19\cdot23\) <>2
nên đây là hợp số
d: \(1\cdot2\cdot3\cdot\ldots\cdot100=97\cdot1\cdot2\cdot\ldots\cdot96\cdot98\cdot99\cdot100\) ⋮97
\(97\cdot101\cdot103\) ⋮97
Do đó: \(1\cdot2\cdot3\cdot\ldots\cdot100+97\cdot101\cdot103\) ⋮97
=>Đây là hợp số
NH
5
14 tháng 8 2025
tham khảo :
Bước 1: Đưa về cùng số mũ để dễ so sánh
Ta có thể so sánh bằng cách đưa về cùng mũ bằng cách lấy log hoặc biến đổi mũ.
Ta xét mũ chung là lũy thừa 700:
- \(3^{350} = \left(\right. 3^{350} \left.\right)\)
- \(2^{252} = \left(\right. 2^{252} \left.\right)\)
Nhưng ta cần một cách đơn giản hơn: so sánh
\(\left(\right. 3^{350} \left.\right)^{1 / 350} \text{v} \overset{ˋ}{\text{a}} \left(\right. 2^{252} \left.\right)^{1 / 350}\)
Cái này tương đương so sánh:
\(3 \text{v} \overset{ˋ}{\text{a}} 2^{\frac{252}{350}} = 2^{0.72}\)
Bước 2: Tính 2^0.72
Ta biết:
\(\left(log \right)_{10} \left(\right. 2 \left.\right) \approx 0.3010\) \(0.72 \cdot \left(log \right)_{10} \left(\right. 2 \left.\right) \approx 0.72 \cdot 0.3010 = 0.21672\) \(2^{0.72} = 10^{0.21672} \approx 1.645\)
Bước 3: So sánh
Rõ ràng:
\(3 > 1.645\)
⇒ \(3^{350} > 2^{252}\).
Kết luận:
\(\boxed{3^{350} > 2^{252}}\)
NL
Nguyễn Lê Phước Thịnh
CTVHS
7 tháng 9 2025
a: Số quyển sách Toán là \(200\cdot35\%=70\) (quyển)
b: Số quyển sách Văn là \(200\cdot25\%=50\) (quyển)
Số quyển sách tiếng anh là 200-70-50=200-120=80(quyển)
7 tháng 9 2025
a) Số quyển sách Toán là:
200 * \(\frac{35}{100}\) = 70 (quyển)
b) Số quyển sách Văn là:
200 * \(\frac{25}{100}\) = 50 (quyển)
Số quyển sách Tiếng Anh là:
200 - 70 - 50 = 80 (quyển)
Vậy cửa hàng có 70 quyển sách toán và 80 quyển sách Tiếng Anh
2 tháng 9 2016
Ta có:\(2013A=\frac{2013\left(2013^{2012}+1\right)}{2013^{2013}+1}=\frac{2013^{2013}+2013}{2013^{2013}+1}=\frac{2013^{2013}+1+2012}{2013^{2013}+1}=\frac{2013^{2013}+1}{2013^{2013}+1}+\frac{2012}{2013^{2013}+1}=1+\frac{2012}{2013^{2013}+1}\)
\(2013B=\frac{2013\left(2013^{2013}+1\right)}{2013^{2014}+1}=\frac{2013^{2014}+2013}{2013^{2014}+1}=\frac{2013^{2014}+1+2012}{2013^{2014}+1}=\frac{2013^{2014}+1}{2013^{2014}+1}+\frac{2012}{2013^{2014}+1}=1+\frac{2012}{2013^{2014}+1}\)
Vì 20132013+1<20132014+1
\(\Rightarrow\frac{2012}{2013^{2013}+1}>\frac{2012}{2013^{2014}+1}\)
\(\Rightarrow1+\frac{2012}{2013^{2013}+1}>1+\frac{2012}{2013^{2014}+1}\)
\(\Rightarrow2013A>2013B\)
\(\Rightarrow A>B\)
15 tháng 7 2017
1, Gọi số bị trừ là A; số trừ là B; hiệu là C
Ta có :
A + B + C = 1062
A + (B + C) = 1062
A + A = 1062
A x 2 = 1062
A = 1062 : 2
A = 531
B + C = 531
B = (531 + 279) : 2 = 405
Đáp số : 531; 405
2, A, aaa : a = 111
B, abab : ab = 101
C, abcabc : abc = 1001
VD
3 tháng 10 2016
a, có vì số lẻ - số lẻ = số chẵn
b, có vì lẻ + lẻ - chẵn = chẵn
c, không vì 24a là số chẵn 10b cũng là số chẵn
xui zij
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Olm chào em. Bây giờ mới chỉ là thi giữa kì thôi, em vẫn còn nhiều cơ hội để em gỡ lại điểm số, thay đổi tương lai của chính bản thân. Điều quan trọng là em phải có quyết tâm, nỗ lực và thực sự cố gắng mỗi ngày, rèn luyện trau dồi, bổ sung kiến thức bị thiếu, bị hổng. Dần dần em sẽ thấy được mình tiến bộ không ngừng. Cô tin rằng với nỗ lực, ý chí, quyết tâm và hành động thực tế mỗi ngày sẽ đem lại cho em những điều tuyệt vời mà em không ngờ tới.
Cảm ơn em đã đồng hành cùng Olm trên hành trình tri thức. Chúc em học tập hiệu quả và có những giây phút giao lưu thú vị cùng Olm, em nhé.
Không sao đâu, lần sau bạn cố gắng là được mà.
bn cố gắng lần sau nhé