S=1+3+5+...+99+101
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6.7.168 – 14.85.3 + 17.21.2
= 42 . 168 - 42 . 85 + 42 . 17
= 42 . ( 168 - 85 + 17 )
= 42 . 100
= 4200
= 2.3.7.168 - 2.7.85.3 + 17.2.21
= 21.336 - 21.170 + 21.34
= 21.( 336 + 34 - 170 )
= 21.200
= 4200
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\(\left|2x-4\right|=\left|5x+3\right|\)
\(\Rightarrow\orbr{\begin{cases}2x-4=5x+3\\2x-4=-5x+3\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}2x-4=5x+3\\2x-5x=-5x-3\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}2x-5x=3+4\\2x+5x=-3+4\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}-3x=7\\7x=1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{-7}{3}\\x=\frac{1}{7}\end{cases}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 57 - 3 × X ) × 12 - 24 = 47 × 2 - 82
( 57 - 3 × X ) × 12 - 24 = 94 - 82
( 57 - 3 × X ) × 12 - 24 = 12
( 57 - 3 × X ) × 12 = 12 + 24
( 57 - 3 × X ) × 12 = 36
57 - 3 × X = 36 : 12
57 - 3 × X = 3
3 × X = 57 - 3
3 × X = 54
X = 54 : 3
X = 18
( 57 - 3 × X ) × 12 - 24 = 47 × 2 - 82
= ( 57 - 3 × X ) × 12 - 24 = 94 - 82
= ( 57 - 3 × X ) × 12 - 24 = 12
= ( 57 - 3 × X ) × 12 = 12 + 24
= ( 57 - 3 × X ) × 12 = 36
= 57 - 3 × X = 36 : 12
= 57 - 3 × X = 3
= 3 × X = 57 - 3
= 3 × X = 54
X = 54 : 3
X = 18
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2.x2 = 18
x2 = 18 : 2
x2 = 9
x2 = 32
\(\Rightarrow\)x = 3
( 20 + 21 + 22 ) . x - 3 = 18
=> ( 1 + 2 + 4 ) . x = 21
=> 7 . x = 21
=> x = 21 : 7 = 3
2 . x2 = 18
=> x2 = 9
=> x2 = 32 = ( -3 )2
\(\Rightarrow\orbr{\begin{cases}x=3\\x=-3\end{cases}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời :
a) 83 = ( 23 )3 = 29
b) 39
c) 53
~~Học tốt~~
S=1 + 3 + 5 + ... + 99 + 101
=> S = ( 101 + 1 ) . 51 : 2
=> S = 102 . 51 ; 2
=> S = 5202 : 2
=> S = 2601
Ta có: 1+3+5+...+99+101
Tổng trên là:(1+101).2= 204
Đ/S: 204
k cho mk nha!!!!