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{2.9+[144-25x(15-169/13)}]-1
=2.9+[144-25.(15-13]]-1
=2.9+[144-25.2]]]-1
=2.9+[144-50]]]-1
=18+94-1
=111
Chúc bn học tốt
{2.9+[144-25x(15-169/13)]}-1
=2.9+[144-25.(15-13)]-1
=2.9+[144-50]-1
=18+94-1
=112-1
=111
![](https://rs.olm.vn/images/avt/0.png?1311)
{ 2 . 32 + [ 144 - 52 . ( 15 - 169 : 13 ) ] } - 12019
= { 2 . 9 + [ 144 - 25 . ( 15 - 13 ) ] } - 1
= { 18 + [ 144 - 25 . 2 ] } - 1
= { 18 + [ 144 - 50 ] } - 1
= 18 + 94 - 1
= 112 - 1
= 111
{2 . 3^2 + (144 - 5^2 . (15 - 169 : 13))} - 1^2019
= {2 . 9 + (144 - 25 . ( 15 - 169 : 13))} - 1
= {2 . 9 + (144 - 25 . ( 15 - 13))} - 1
= {2 . 9 + (144 - 25 . 2)} - 1
= {2 . 9 + (144 - 50)} - 1
= {2 . 9 + 94} - 1
= {18 + 94} - 1
= 112 - 1
= 111
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
câu 1 bỏ dấu ngoặc rồi tính
( 36 + 79 ) + ( 145 _ 79 _ 36 )
\(=36+79+145-79-36\)
\(=\left(36-36\right)+\left(79-79\right)+145\)\
\(=0+0+145=145\)
10 _ [ 12 _ ( -9 _ 1 ) ]
\(=10-12-10\)
\(=10-10-12\)
\(=0-12=-12\)
( 38 _ 29 + 43) _ ( 43 + 38 )
\(=38-29+43-43-38\)
\(=\left(38-38\right)+\left(43-43\right)-29\)
\(=0+0-29=-29\)
271 _ [ ( -43 ) + 271 _ ( -17 ) ]
\(=271+43-271-17\)
\(=\left(271-271\right)+\left(43-17\right)\)
\(=0+26=26\)
- 144 _ [ 29 _ ( + 144 ) _ ( + 144 )]
\(=-144-19+144+144\)
\(=\left(-144+144+144\right)-19\)
\(=144-19=125\)
đợi mk lm tiếp câu 2 nha .
bài 2 tính tổng các số nguyên
- 18 < hoặc bằng x < hoặc bằng 17
\(\Rightarrow x\in\left\{-18;-17;-16;....;17\right\}\)
tổng \(x=-18+\left(-17\right)+\left(-16\right)+...+17=-18\)
- 27 < hoặc bằng x < hoặc bằng 27
\(\Rightarrow x\in\left\{-27;-26;-25;..;27\right\}\)
Tổng \(x=-27+\left(-26\right)+\left(-25\right)+...+27=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2,
a) \(315-\left(135-x\right)=215\)
\(\Rightarrow135-x=315-215\)
\(\Rightarrow135-x=100\)
\(\Rightarrow x=135-100\)
\(\Rightarrow x=35\)
b) \(x-320:32=25\cdot16\)
\(\Rightarrow x-10=5^2\cdot4^2\)
\(\Rightarrow x-10=20^2\)
\(\Rightarrow x-10=400\)
\(\Rightarrow x=410\)
c) \(3\cdot x-2018:2=23\)
\(=3\cdot x-1009=23\)
\(\Rightarrow3\cdot x=1032\)
\(\Rightarrow x=1032:3\)
\(\Rightarrow x=344\)
d) \(280-9\cdot x-x=80\)
\(\Rightarrow280-x\cdot\left(9+1\right)=80\)
\(\Rightarrow280-10\cdot x=80\)
\(\Rightarrow10\cdot x=280-80\)
\(\Rightarrow10\cdot x=200\)
\(\Rightarrow x=20\)
e) \(38\cdot x-12\cdot x-x\cdot16=40\)
\(\Rightarrow x\cdot\left(38-12-16\right)=40\)
\(\Rightarrow x\cdot10=40\)
\(\Rightarrow x=40:10\)
\(\Rightarrow x=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=2/10+3/10+4/10+......+13/10
=\(\frac{2+3+4+......+13}{10}\)
=90/10=9
k cho mình nha
![](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)
(36 x 15 x 169):(5 x 18 x 13)
= (18 x 2 x 3 x 5 x 13 x 13):(5 x 18 x 13)
= 2x3x13x(5 x 18 x 13):(5 x 18 x 13)
= 2 x 3 x 13
= 78
\(\left(2\cdot3^2+\left(144-5^2\cdot\left(15-169:13\right)\right)\right)-9999^0\)
\(=\left(2\cdot9+\left(144-25\cdot\left(15-13\right)\right)\right)-1\)
\(=\left(18+\left(144-25\cdot2\right)\right)-1\)
\(=\left(18+\left(144-50\right)\right)-1\)
\(=\left(18+94\right)-1\)
\(=112-1\)
\(=111\)