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a) 8x + ( 2+5+7+12+19+31+50+81) = 447
8x + 207 = 447
8x = 447 - 207 = 240
x = 240 : 8 = 30
b) 10x + [( 21 + 3 ) x 10 : 2 ] = 335
10x + 120 = 335
10x = 335 - 120 = 215
x = 215 : 10
x = 21,5
Ta có : (x + 3) + (x + 5) + (x + 7) + ..... + (x + 21) = 335
=> x + x + x + x + (3 + 5 + 7 + ..... + 21) = 335
=> 10x + 120 = 335
=> 10x = 335 - 120
=> 10x = 215
=> x = 21,5
ta có : (x + 3) + (x + 5) + (x + 7) + ..... + (x + 21) = 335
<=> x + x + x + x + (3 + 5 + 7 + ..... + 21) = 335
<=> 10x + 120 = 335
=> 10x = 335 - 120
=> 10x = 215
vậy x = 21,5
dài quá làm hộ câu 1-5 thoy
1) x=21-13
x=8
2)x=-55+41
x=-14
3)x=-21+15
x=-6
4)x=3-3
x=0
5) x= -98-37
x=-135
15 ) 57 - ( x - 46 ) = - 13
57 - x + 46 = -13
103 - x = -13
x = 103 + 13
x = 116
16 ) -x - 23 = -38 - 42
- ( x + 23 )=- ( 38 + 42)
x + 23 = 38 + 42
x = 38 + 42 -23
x = 57
17 ) x - ( - 7 ) = -4 – 14
X + 7 = -18
X = -18-7
X = -25
18 ) 18 - x = -8 - ( - 15 )
18 – x = 7
X = 18 – 7
X = 11
19 ) 45 - ( x + 17 ) = - 26
45 – x - 17 = -26
28 – x = -26
X = 28 + 26
X = 54
20 ) 3. ( x + 5 ) - x - 11 = 24
3x +15 –x – 11 = 24
2x + 4 =24
2x = 24 – 4
2x = 20
X = 20 : 2
X = 10
21 ) 14 - ( x - 7 ) = - 8 - ( - 9 )
14 – x + 7 = 1
21 – x = 1
X = 21 – 1
X = 20
22 ) 15 - ( x - 2 ) = - 7 + 8
15 – x + 2 = 1
17 – x = 1
X = 17 – 1
X = 16
6) x + ( - 71 ) = ( - 55 ) + 85
X – 71 = 30
X = 30 + 71
X = 101
7 ) x - ( - 45 ) = - 63 + 27
X +45 = -16
X = -16 -45
X = - 61
.
\(\text{(x−2)(2y+1)=17}\)
\(\text{⇒(x−2)(2y+1)=1.17=17.1=(−1).(−17)=(−17).(−1)}\)
Ta có bảng sau:
| x−2 | 1 | 17 | −1 | −17 |
| 2y+1 | 17 | 1 | −17 | −1 |
| x | 3 | 19 | 1 | −15 |
| y | 8 | 0 | −9 | −1 |
Vậy \(\hept{\begin{cases}x=3\\y=8\end{cases}\hept{\begin{cases}x=19\\y=0\end{cases}\hept{\begin{cases}x=1\\y=-9\end{cases}\hept{\begin{cases}x=-15\\y=-1\end{cases}}}}}\)
học tốt
\(5+x-3=5-\left(x+4\right)\)
\(5+x-3=5-x-4\)
\(x+x=5-4-5+3\)
\(2x=-1\)
\(x=\frac{-1}{2}\)
vay \(x=\frac{-1}{2}\)
\(x-\left(5.\left|-7\right|+3\right)=\left|-8\right|+6-2\)
\(x-\left(5.7+3\right)=8+6-2\)
\(x-38=12\)
\(x=12+38\)
\(x=50\)
vay \(x=50\)
\(\left|x-3\right|+7=0\)
\(\left|x-3\right|=-7\)( ko ton tai)
\(12-3\left|x-1\right|=6\)
\(3\left|x-1\right|=6\)
\(\left|x-1\right|=2\)
\(\Rightarrow\orbr{\begin{cases}x-1=2\\x-1=-2\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)
vay \(\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)
A) 34 + ( 9 - 21 ) = 3417 - (0 + 3417)
B) 9 - ( 55 - ( 49 + (-28 - 5 ))) = 13 -( 47 + -25 - 32 - 8 ))
C) |-1 - 1| - 1 + 1 = 0
D) |2 - 2| + 2 = 2
6)
(19-x)-46=-12
19-x=-12+46
19-x=34
x=19-34
x=-15
7)=>x-2=0
x=0+2
x=2
8)=>5-x=2
x=5-2
x=3
9) đề thiếu
10)=>x+1=9
x=9-4
x=8
a) (x+12) . (x-3) = 0
Suy ra x+12 = 0 hoặc x-3 = 0
Vậy x = -12 hoặc x = 3
b) (- +5) . (3-x) = 0
Suy ra 3-x=0
Vậy x=3