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\(...\Rightarrow\left(2x-6\right)=4^9:4^7\)
\(\Rightarrow2x-6=4^2\)
\(\Rightarrow2x-6=16\)
\(\Rightarrow2x=22\)
\(\Rightarrow x=11\)
(2x-6). 47 = 49
2x-6 = \(\dfrac{4^9}{4^7}\)
2x = 16+6
x = \(\dfrac{22}{2}\)
x = 11
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a) | 5-x |=| 15-47|
| 5-x |=32
=> 5-x=32 hoặc 5-x=-32
*Nếu 5-x=32 => x=5-32=-27
*Nếu 5-x=-32 => x=5-(-32)=37
b) x=4 hoặc x=-4
c) 5. ( x-3)2=125
( x-3)2 = 125:5
( x-3)2 = 25
( x-3)2 = 52
=> x-3=5 => x=5+3=8
d) 49-( 2x-1)2=0
( 2x-1)2 = 49-0
( 2x-1)2 = 49
( 2x-1)2 = 72
=> 2x-1=7
2x=7+1
2x=8
x=8:2
x=4
tick nha (chi tiết lắm đó)
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1-2+3-4+5-6+...+47-48+49-50
= (1-2)+(3-4)+(5-6)+...+(47-48)+(49-50) có 25 số hạng
=-1 . 25
=-25
xin like
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1, 42 x 53 + 47 x 156 - 47 x 114
= 42 x 53 + 47 x ( 156 - 114 )
= 42 x 53 + 47 x 42
= 42 x ( 53 + 47 )
= 42 x 100
= 4200
2, 53 x ( 51 + 4 ) + 53 x ( 49 + 96 ) + 53
= 53 x 51 + 53 x 4 + 53 x 49 + 53 x 96
= 53 x ( 51 + 49 ) + 53 x ( 96 + 4 ) + 53
= 53 x 100 + 53 x 100 + 53
= 5300 + 5300 + 53
= 10653
3, 42 x ( 15 + 96 ) + 6 x ( 25 + 4 ) x 7
= 42 x 15 + 42 x 96 + 42 x 25 + 42 x 4
= 42 x ( 15 + 25 ) + 42 x ( 96 + 4 )
= 42 x 40 + 42 x 100
= 42 x ( 100 + 40 )
= 42 x 140
= 5880
Tk mk nha !! ~
42. 53 + 47. 156 - 47. 114 = 42.53 +47.(156-114)
=42.53 +47. 42
= 42(53+47)
= 42.100 = 4200
53. ( 51 + 4 ) + 53. ( 49 + 96 ) + 53 = 53(51+4+49+96+1)
= 53. 201 = 10653
42. ( 15 + 96 ) + 6. ( 25 +4 ). 7 = 42. ( 15 + 96 ) + 42(25+4)
= 42(15+96+25+4)
= 42. 140 = 5880
mk lm xong rồi add friend nha
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1+3+5+7+...+47+49+...+(-2)+(-4)+(-6)+...+(-48)+(-50)
=(-2+1)+(-4+3)+...+(-50+49)
=(-1)+(-1)+(-1)+...+(-1) (25 số -1)
= -25
![](https://rs.olm.vn/images/avt/0.png?1311)
A = - ( 5 - 6 ) - ( 3 - 4 + 5 - 7 )
A = -5 + 6 - 3 + 4 - 5 + 7
A = ( 6 + 4 ) + ( -5 + (-5) ) + ( -3 + 7 )
A = 10 + (-10) + 4
A = 0 + 4
A = 4
P = ( 1 + 3 + 5 + ... + 47 + 49 ) - ( 2 + 4 + 6 + ... + 48 + 50 )
P = \(\frac{\left(1+49\right)\cdot\left(\left(49-1\right):2+1\right)}{2}\) - \(\frac{\left(2+50\right)\cdot\left(\left(50-2\right):2+1\right)}{2}\)
P = \(625-650\)
P = \(-25\)
(2x - 6) . 4⁷ = 4⁹
2x - 6 = 4⁹ : 4⁷
2x - 6 = 4²
2x - 6 = 16
2x = 16 + 6
2x = 22
x = 22 : 2
x = 11
(2x-6).4^7 = 4^9
=> 2x-6=4^9 ÷ 4^7
=>2x-6=4^2 = 16
=> 2x = 22
=> x = 11