Tìm x \(\in\)N . Biết : 17x - 4x = 88 : 86 + ( 2016 )0
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17x - 4x = 88:86+(2016)0
<=> 82 + 1 = 13x
<=> 65 = 13x
<=> x = 5
\(17x-4x=8^8:8^6+\left(2016\right)^0\)
\(\Rightarrow13x=8^2+1\)
\(\Rightarrow13x=65\)
\(\Rightarrow x=5\)
Vậy \(x=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
17x – 4x = 88: 86 + (2016)0 13x = 82 + 1 = 64 + 1 = 65 x = 65:13 = 5 x = 5 |
17x – 4x = 88: 86 + (2016)0 13x = 82 + 1 = 64 + 1 = 65 x = 65:13 = 5 x = 5 |
![](https://rs.olm.vn/images/avt/0.png?1311)
17x + 4x = 86 : 86 + 20160
21x = 1+ 1
21x = 2
x = 2 : 21
x = \(\frac{2}{21}\)
TL : 17x\(\frac{2}{21}\)+ 4 x \(\frac{2}{21}\)= 86: 86 + (2016)0
![](https://rs.olm.vn/images/avt/0.png?1311)
17x - 4x = 8^2 + 1
(17 - 4 )x = 64 + 1
13x = 65
x = 65 : 13
x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1.\(\left|9-7x\right|=5x-3\)
\(\Leftrightarrow\orbr{\begin{cases}9-7x=5x-3\\9-7x=-5x-3\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}-7x-5x=-9-3\\-7x+5x=-9-3\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}-12x=-12\\-2x=-12\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-12:\left(-12\right)\\x=-12:\left(-2\right)\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=1\\x=6\end{cases}}\)
2.\(8x-\left|4x+1\right|=x+2\)
\(\Rightarrow\left|4x+1\right|=8x-x+2\)
\(\Rightarrow\left|4x+1\right|=7x+2\)
\(\Leftrightarrow\orbr{\begin{cases}4x+1=7x+2\\4x+1=-7x+2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}4x-7x=2-1\\4x+7x=2-1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}-3x=1\\11x=1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=1:\left(-3\right)\\x=1:11\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{-1}{3}\\x=\frac{1}{11}\end{cases}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
12 × 4 = 4 × 12
106 × 3 = 3 × 106
(17 × 5) × 2 = 17 × (5 × 2)
86 × 2 × 5 = 86 × (2 × 5)
b)
7 × 1 = 7
432 × 1 = 432
519 × 0 = 0
1 × 0 = 0
2 × 0 = 0
3 456 × 1 = 3 456
Bài làm
17x - 4x = 88 : 86 + ( 2016 )0
17x - 4x = 82 + 1
17x - 4x = 64 + 1
17x - 4x = 65
x( 17 - 4 ) = 65
x . 13 = 65
x = 65 : 13
x = 5
Vậy x = 5
# Học tốt #
17x-4x=88:86+(2016)0
13x=82+1
13x=64+1
13x=65
x=65:13
x=5
vậy x=5