![](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)
a)x+23+(-43)+(-23)=x+43+[(-23)+23]=x+43
b)x+(-35)+(-x)+45=[x+(-x)]+(-35)+45=10
c)a+67+(-68)+(-a)=[(-a)+a]+67+(-68)=-1
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) A = 84 − x + 84 − 23 ; A = 84 − x − 84 − 23 A = 84 − 84 − x − 23 A = − x − 23 b ) B = 39 + x − 15 − 39 ; B = 39 + x − 15 − 39 B = 39 − 39 + x − 15 B = x − 15
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -x+18-4x-64-16=-x-4x+18-64-16=-5x-62
b) x+36+4+2x+24=x+2x+36+4+24=3x+64
c) x-23+13+2x-17+57=x+2x-23+13-17+57=3x+29
Tick nha
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
a.
$=-37-x-23+15=-x-(37+23)+15=-x-60+15=-x-(60-15)=-x-45$
b.
$=176-176+x-42=0+x-42=x-42$
c.
$=1270-1270+2x+31=0+2x+31=2x+31$
d.
$=2x-141-231+461=2x-(141+231)+461=2x-372+461$
$=2x+(461-372)=2x+89$
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x+37+\left(-17\right)+\left(25-x\right)=x+37-17+25-x=45\)
b) \(-66-\left(y-16\right)+\left(150-y\right)=-66-y+16+150-y=100-2y\)
c) \(\left(a+b+c\right)-\left(-a+b+c\right)=a+b+c+a-b-c=2a\)
d) \(\left(-x+35\right)-\left(45-x\right)=-x+35-45+x=-10\)
![](https://rs.olm.vn/images/avt/0.png?1311)
M = 100 - ( 13 - x ) + ( 23 - 100)
=> M = 100 - 13 + x + 23 - 100
=> M = ( 100 -100 ) + ( 23 -13 ) + x
=> M = 0 + 10 + x
=> M = 10 + x
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính giá trị biểu thức:
A = (169 - 1 . 1) . (169 - 2 . 2) . ... . (169 - 23 . 23)????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????/
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x-(-23)+46
=x+23+46
=x+69
b) (45-x)-(-87)+(-169)
=45-x+87-169
=-37-x