![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(7^5:7^3-x=23\)
\(7^2-x=23\)
\(49-x=23\)
\(x=49-23\)
\(x=26\)
\(\left(2x-7\right).5^8=5^{10}\)
\(\left(2x-7\right)=5^{10}:5^8\)
\(2x-7=5^{10-8}\)
\(2x-7=5^2\)
\(2x-7=25\)
\(2x=32\)
\(x=32:2\)
\(x=16\)
* Mình nghĩ câu a sửa đề như vậy sẽ đúng hơn!
![](https://rs.olm.vn/images/avt/0.png?1311)
(2x+5).7=73
<=>2x.7+5.7=73
<=>14x+35=73
<=>14x=73-35
<=>14x=38
<=>x=38:14
=>x= 17/7
![](https://rs.olm.vn/images/avt/0.png?1311)
(2x+5) . l-7l = 73
=(2x+5) . 7 =73
=(2x+5) =\(\frac{73}{7}\)
=2x =\(\frac{73}{7}\) - 5
=2x =\(\frac{38}{7}\)
=x =\(\frac{38}{7}\) :2
=x =\(\frac{19}{7}\)
(2x+5).|-7|=73
=> (2x+5).7=73
=> 2x+5=73:7
=> 2x+5=\(\frac{73}{7}\)
=>2x=\(\frac{73}{7}\)-5
=>2x=\(\frac{38}{7}\)
=>x=\(\frac{38}{7}\):2
=>x=\(\frac{19}{7}\)
vậy.....
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: Ta có: \(71-\left(x+33\right)=26\)
\(\Leftrightarrow x+33=45\)
hay x=12
b: Ta có: \(\left(x+73\right)-26=76\)
\(\Leftrightarrow x+73=102\)
hay x=29
c: Ta có: \(45-\left(x+9\right)=6\)
\(\Leftrightarrow x+9=39\)
hay x=30
a) 71 - ( 33 + x ) = 26
(33 + x ) = 71 -26
33 + x = 45
x = 45 - 33 = 12
b) ( x + 73 ) - 26 = 76
( x + 73 ) = 102
x = 102 - 73 = 29
c) 45 - ( x + 9 ) = 6
( x + 9 ) = 45 - 6 = 39
x = 39 - 9 = 30
d) 89 - ( 73 - x ) = 20
73 - x = 89 - 20
73 - x = 69
x = 73 - 69 = 4
e) 4(x+41) = 400
x + 41 = 400 : 4 = 100
x = 100 - 41 = 59
f) 11(x-9 ) = 77
x - 9 = 77 : 11 = 7
x = 7 + 9 = 16
g) x + 7 = 25 + 13 = 38
x = 38 - 7 = 31
h) x + 4 = 198 - 120 = 78
x = 78 - 4 = 74
i) x - 9 = 350 : 5 = 70
x = 70 + 9 = 79
j) 2x - 49 = 5 . 9 = 45
2x = 45 + 49 = 94
x = 94 : 2 = 47
k) 25 + 3( x - 8 ) = 106
3(x-8 ) = 106 - 25 = 81
x - 8 = 81 : 3 = 27
x = 27 +8= 35
l) 9( x + 4 ) - 25 = 20
9( x + 4 ) = 20 + 25 = 45
x + 4 =45 : 9 = 5
x = 5 - 4 = 1
m) 200 - ( 2x + 6 ) = 64
2x + 6 = 200 - 64 = 136
2x = 136 - 6 = 130
x = 130 : 2 = 65
![](https://rs.olm.vn/images/avt/0.png?1311)
x - 48 : 3 = 12
x - 16 = 12
x = 12 + 16
x = 28
còn câu thứ 2 thì chia có dư bạn xem lại xem có chép sai đầu bài ko
![](https://rs.olm.vn/images/avt/0.png?1311)
`#040911`
\(2^x+2^{x-3}-2^{x+5}=73\)
\(\Rightarrow2^x+2^x\div2^3-2^x\cdot2^5=73\\ \Rightarrow2^x+2^x\cdot\dfrac{1}{8}-2^x\cdot2^5=73\\ \Rightarrow2^x\cdot\left(1+\dfrac{1}{8}-2^5\right)=73\\ \Rightarrow2^x\cdot\left(-\dfrac{247}{8}\right)=73\\ \Rightarrow2^x=73\div\left(-\dfrac{247}{8}\right)\\ \Rightarrow2^x=-\dfrac{584}{247}\)
Bạn xem lại đề.
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
1. $(x+2)-2=0$
$x+2=2$
$x=0$
2.
$(x+3)+1=7$
$x+3=7-1=6$
$x=6-3=3$
3.
$(3x-4)+4=12$
$3x-4+4=12$
$3x=12$
$x=12:3=4$
4.
$(5x+4)-1=13$
$5x+4=13+1=14$
$5x=14-4=10$
$x=10:5=2$
5.
$(4x-8)-3=5$
$4x-8=5+3=8$
$4x=8+8=16$
$x=16:4=4$
6.
$3+(x-5)=7$
$x-5=7-3=4$
$x=4+5=9$
7.
$8-(2x-4)=2$
$2x-4=8-2=6$
$2x=6+4=10$
$x=10:2=5$
8.
$7+(5x+2)=14$
$5x+2=14-7=7$
$5x=7-2=5$
$x=5:5=1$
9.
$5-(3x-11)=1$
$3x-11=5-1=4$
$3x=11+4=15$
$x=15:3=5$
10.
$16-(8x+2)=6$
$8x+2=16-6=10$
$8x=10-2=8$
$x=8:8=1$
Ta có:\(\left(2x+5\right)\times7=73\)
\(\Rightarrow2x+5=\frac{73}{7}\)
\(\Rightarrow2x=\frac{73}{7}-5\)
\(\Rightarrow2x=\frac{38}{7}\Rightarrow x=\frac{19}{7}\)