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-11-(19-x)=50
=> -11 -19+x=50
=> -30+x=50
x=-30-50
x=-80
k cho mh nha
mh trả lời đầu tiên
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![](https://rs.olm.vn/images/avt/0.png?1311)
15 - ( 3 + 2x ) = 22
<=> 15 - ( 3 + 2x ) = 4
<=> 3 + 2x = 11
<=> 2x = 8
<=> x = 4
Vậy x = 4
-11 - ( 19 - x ) = 50
<=> 19 - x = -61
<=> x = 80
Vậy x = 80
2x * | +4 | = 6
<=> 2x * 4 = 6
<=> 2x = 3/2
<=> x = 3/4
Vậy x = 3/4
( 7 + x ) - ( 21 - 13 ) = 32
<=> 7 + x - 8 = 32
<=> x - 8 = 25
<=> x = 33
Vậy x = 33
*15 - ( 3 + 2x ) = 22
15 - ( 3 + 2x ) = 4
3 + 2x = 15 - 4
3 + 2x = 11
2x = 11 - 3
2x = 8
x = 8 : 2 = 4
* -11 - ( 19 - x ) = 50
19 - x = -11 - 50
19 - x = -61
x = 19 - ( -61 )
x = 80
* 2x . |+4| = 6
=> 2x . 4 = 6
2x = 6 : 4
2x = 3/2
x = 3/2 : 2 = 3/4
* ( 7 + x ) - ( 21 - 13 ) = 32
( 7 + x ) - 8 = 32
7 + x = 32 + 8
7 + x = 40
x = 40 - 7
x = 33
![](https://rs.olm.vn/images/avt/0.png?1311)
A=1+2+3+...+70
A=(70+1).[(70-1):1+1]:2
A=71.70:2
A=4970:2
A=2485
B=5+10+15+...+100
B=(100+5).[(100-5):5+1]:2
B=105.20:2
B=2100:2
B=1050
![](https://rs.olm.vn/images/avt/0.png?1311)
a, x + 26 = 39 + (-5)
x + 26 = 39 - 5
x + 26 = 34
x = 34 - 26
x = 8
b, |x| + 50 = (-|-26|) +76
|x| +50 = (-26) +76
|x| +50 = 76 - 26
|x| +50 = 50
|x| = 50 -50
|x| = 0
c, |x| + 17 = (-21)+19
|x| + 17 = - (21-19)
|x| + 17 = - 2
|x| không tồn tại
d. |x-21|= 2.(|-11| + |-3|)
|x-21|= 2.(11+3)
|x-21|= 2.14
|x-21|= 28
x = 28+21 hoặc 21-28
x = 49 hoặc -7
e. hình như lộn đề vì |x-54|-7|
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-\frac{7}{11}.\frac{11}{19}+\frac{-7}{11}.\frac{8}{19}+\frac{-4}{11}=-\frac{7}{11}.\left(\frac{11}{19}+\frac{8}{19}\right)-\frac{4}{11}\)
\(=-\frac{7}{11}.1-\frac{4}{11}=-\frac{7}{11}-\frac{4}{11}\)
\(=-\frac{11}{11}=-1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)x-160:40=45
x-4=45
x=45+4
x=49
b)(x+45):15=80
x+45=80.15
x+45=1200
x=1155
c)x-50:25=8
x-5=8
x=13
d)5.x-38:19=13
5x-2=13
5x=15
x=3
d)(5x-38):19=13
5x-38=247
5x=285
x=57
e)(3x-18)(2x-20)=0
\(\Rightarrow\left[\begin{array}{nghiempt}3x-18=0\\2x-20=0\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}3x=18\\2x=20\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=6\\x=10\end{array}\right.\)
Vậy x=6;10
g)Gọi số tự nhiên thứ nhất là a
số tự nhiên thứ hai là b
Vì lấy số lớn chia số nhỏ đc thương là 9 và dư là 11
Mà a+b=361
a=361-b
Suy ra:(11+a):b=9
Ta có:(11+a):b=9
(11+361-b):b=9
(372-b):b=9
372:b-1=9
372:b=10
b=372:10
b ko TM
Xem lại đề
x - 160 : 40 = 45
x - 4 = 45
x = 45 + 4
x = 49
Vậy x = 49
(x + 45 ):15 = 80
x + 45 = 80.15
x + 45 = 1000
x = 1000 - 45
x = 955
Vậy x = 995
x - 50:25 = 8
x - 2 = 8
x = 8 + 2
x = 10
Vậy x = 10
5.x - 38:19 = 13
5.x - 2 = 13
5.x = 13 + 2
x = 15:5
x = 3
Vậy x = 3
( 5.x - 38 ):19 = 13
5.x - 38 = 13.19
5.x - 38 = 247
5.x = 247 + 38
5.x = 285
x = 285:5
x = 57
Vậy x = 57
( 3x - 18 ).( 2x - 20 ) = 0
3x - 18 = 0 hoặc 2x - 20 = 0
+) 3x - 18 = 0
3x = 18
x = 6
+) 2x - 20 =0
2x = 20
x = 10
Vậy x = 6 hoăc x = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
A = ( -4/5 + 4/3 ) + (-5/4 + 14/5) - 7/3
= 8/15 + 31/20 - 7/3
= 25/12 - 7/3
= -1/4
B = 8/3 x 2/5 x 3/8 x 10x 19/92
= 16/15 x 15/4 x 19/92
= 4x19/92
= 19/23
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x+5=20-\left(12-7\right)\)
\(\Rightarrow x+5=20-5\)
\(\Rightarrow x+5=15\)
\(\Rightarrow x=15-5\)
\(\Rightarrow x=10\)
b) \(15-\left(3+2x\right)=2^2\)
\(\Rightarrow3+2x=15-4\)
\(\Rightarrow3+2x=11\)
\(\Rightarrow2x=11-3\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=\dfrac{8}{2}\)
\(\Rightarrow x=4\)
c) \(-11-\left(19-x\right)=50\)
\(\Rightarrow19-x=-11-50\)
\(\Rightarrow19-x=-61\)
\(\Rightarrow x=61+19\)
\(\Rightarrow x=80\)
d) \(159-\left(25-x\right)=43\)
\(\Rightarrow25-x=159-43\)
\(\Rightarrow25-x=116\)
\(\Rightarrow x=25-116\)
\(\Rightarrow x=-91\)
e) \(\left(79-x\right)-43=-\left(17-52\right)\)
\(\Rightarrow\left(79-x\right)-43=52-17\)
\(\Rightarrow79-x-43=35\)
\(\Rightarrow36-x=35\)
\(\Rightarrow x=1\)
f) \(\left(7+x\right)-\left(21-13\right)=32\)
\(\Rightarrow7+x-8=32\)
\(\Rightarrow x-1=32\)
\(\Rightarrow x=32+1\)
\(\Rightarrow x=33\)
g) \(-x+20=-15+8+13\)
\(\Rightarrow-x+20=6\)
\(\Rightarrow x=20-6\)
\(\Rightarrow x=14\)
h) \(-\left(-x+13-142\right)+18=55\)
\(\Rightarrow x-13+142+18=55\)
\(\Rightarrow x+147=55\)
\(\Rightarrow x=55-147\)
\(\Rightarrow x=-92\)
\(-11-\left(19-x\right)=50\)
\(-11-19+x=50\)
\(x-\left(11+19\right)=50\)
\(x-30=50\)
\(x=50+30\)
\(x=80\)
\(-11-\left(19-x\right)=50\Leftrightarrow19-x=-11-50=-61\Leftrightarrow x=19+61=80\)