86;[2.(2x-2)-7]+16=18
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8. Find the value of 14 x 14 + 2 x 14 x 86 + 86 x 86.
\(=\left(14\times3\right)+\left(86\times3\right)+2\)
\(=42+258+2\)
\(=300+2\)
\(=302\)
14 x 14 + 2 x 14 x 86 + 86 x 86
= 14 x 14 + 14 x 86 + 14 x 86 + 86 x 86
= 14 x ( 14 + 86 ) + 86 x ( 14 + 86 )
= 14 x 100 + 86 x 100
= 100 x ( 14 + 86 )
= 100 x 100
= 10000
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a: 86-x>86-4
=>-x>-4
hay x<4
b: x+28<28+3
=>x+28<31
hay x<3
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34*86+51*86+85*14
=86*(34+51)+85*14
=86*85+85*14
=85*(86+14)
=85*100
=8500
\(34\cdot86+51\cdot86+85\cdot14\)
\(=(34+51)\cdot(86+14)\)
\(=85\cdot100=8500\)
Chúc bạn học tốt
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ĐKXĐ:\(\left\{{}\begin{matrix}x\ne0\\x\ne-3\end{matrix}\right.\)
\(\dfrac{80}{x}-\dfrac{80}{x+3}=\dfrac{3}{20}\\ \Leftrightarrow80\left(\dfrac{1}{x}-\dfrac{1}{x+3}\right)=\dfrac{3}{20}\\ \Leftrightarrow\dfrac{x+3-x}{x\left(x+3\right)}=\dfrac{3}{1600}\\ \Leftrightarrow\dfrac{3}{x^2+3x}=\dfrac{3}{1600}\\ \Leftrightarrow3x^2+9x=4800\\ \Leftrightarrow x^2+3x-1600=0\\\)
Nghiệm xấu lắm bạn
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a) 86*(121-120+9)==86*10=860
b)136*(75+19+6)=136*100=13600
Mk giải r đó nha chắc chắn đúng
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86 . ( 21 - 59 ) + 59 . ( 86 - 21 )
= ( 86 - 86 ) . ( 59 - 59 ) . ( 21 - 21 )
= 0 . 0 . 0
= 0
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Có ngu ko đấy, dễ mà???
85.(-24+86)+86.(-85+24)
=-85.24+85.86-86.85+86.24
=-85.24+86.24
=24.(-85+86)
=24.1
=24
Có bạn nào cần đề thi HSG Toán lớp 6 ko? Mình cho nè !
Link: https://dethi.violet.vn/present/show/entry_id/11006794
Chúc bạn học tốt ~ !
\(86:\left[2\left(2x-2\right)-7\right]+16=18\)
\(86:\left[4x-4-7\right]=2\)
\(4x-11=86:2\)
\(4x-11=43\)
\(4x=54\)
\(x=13,5\)
vậy \(x=13,5\)
86: 2 2x − 2 − 7 + 16 = 18
86: 4x − 4 − 7 = 2
4x − 11 = 86:2
4x − 11 = 43
4x = 54
x = 13,5
vậy x = 13,5
chúc cậu hok tốt nah @_@