→[7600-(40:2+353)]:5
giúp mình với ❤
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
`@` `\text {Ans}`
`\downarrow`
`a)`
\(x \times 27 + x \times 83 = 23400\)
`x \times (27 + 83) = 23400`
`x \times 110 = 23400`
`x = 23400 \div 110`
`x = 2340/11`
Vậy, `x = 2340/11`
`b)`
`x \times 153 - x \times 53 = 7600`
`x \times (153 - 53) = 7600`
`x \times 100 = 7600`
`x = 7600 \div 100`
`x = 76`
Vậy, `x = 76.`
3 + 3 + 3 - 3 - 3 = 3
3 - 3 - 3 : 3 + 1 = 2
3 + 3 - 3 + 3 : 3 = 2
CÒN LẠI ĐNAG NGHĨ
3 + 3 - 3 - 3 : 3 = 2
3 + 3 - 3 + 3 - 3 = 3
3 + 3 - 3 + 3 : 3 = 4
3 + 3 : 3 + 3 : 3 = 5
\(y'=3mx^2-4mx-\left(m+1\right)\)
- Với \(m=0\Rightarrow y'=-1< 0\) hàm nghịch biến trên R (thỏa)
- Với \(m\ne0\) hàm nghịch biến trên R khi:
\(\left\{{}\begin{matrix}3m< 0\\\Delta'=4m^2+3m\left(m+1\right)\le0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}m< 0\\7m^2+3m\le0\\\end{matrix}\right.\)
\(\Leftrightarrow-\dfrac{3}{7}\le m< 0\)
Vậy \(-\dfrac{3}{7}\le m\le0\Rightarrow m=0\)
S có 1 phần tử
1 It took us 2 hours to write this letter
2 It takes me a day to paint this house
3 The weather is so cold that we couldn't go out
4 My friend is so sick that he can't go to school
5 You'd better not drink too much coffee
6 The stomachache prevented Mr Thanh from enjoying the meal
7 The children enjoyed walking in the rain
8 What a beautiful house
b. \(\left(2x+1\right)+\left(4x+3\right)+\left(6x+5\right)+...+\left(100x+99\right)=7600\)
\(\rightarrow\left(2x+4x+6x+...+100x\right)+\left(1+3+5+...+99\right)=7600\)
\(\rightarrow\frac{\left(2x+100x\right).50}{2}+\frac{\left(1+99\right).50}{2}=7600\)
\(\rightarrow51x.50+50.50=7600\)
\(\rightarrow51x.50+2500=7600\)
\(\rightarrow51x.50=7600-2500\)
\(\rightarrow51x.50=5100\)
\(\rightarrow50x=100\)
\(\rightarrow x=\frac{100}{50}=2\)
Vậy x = 2
\(\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\left(0,5-1\dfrac{3}{5}\right)\)
\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\left(\dfrac{1}{2}-\dfrac{8}{5}\right)\)
\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\dfrac{11}{10}\)
\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{33}{80}\)
\(\Rightarrow x:2,2=\dfrac{33}{80}:\dfrac{1}{6}\)
\(\Rightarrow x:2,2=\dfrac{99}{40}\)
\(\Rightarrow x=\dfrac{99}{40}\times2,2\)
\(\Rightarrow x=\dfrac{1089}{200}\)
=>(x:2,2)*1/6=-3/8(1/2-8/5)=33/80
=>x:2,2=99/40
=>x=1089/200
[ 7600 - ( 40 : 2 + 353 ) ] : 5
= [ 7600 - ( 20 + 1225 ) ] : 5
= [ 7600 - 1245 ] : 5
= 6355 : 5
= 1271
`[7600-(40:2+35^3)]:5`
`=[7600-(40:2+42875)]:5`
`=[7600-(20+42875)]:5`
`=[7600-42895]:5`
`=-35295:5`
`=-7059`