(273-x)-140=50

=>273-x=50+140

=>273-x=190

=>x=273-190

=>x=83

K mik mik k lại

đáp án bằng 83 nha mấy bn

a) 19 + (x - 23) = 50

x - 23 = 50 - 19

x - 23 = 31

=> x  = 31 + 23

     x = 54

b) (273 - x) - 140 = 34

(273 - x) = 34 + 140

(273 - x) = 174

x = 273 - 174

x = 99

c) 56 - (x - 14) = 22

x - 14 = 56 - 22

x - 14 = 34

x = 34 + 14

x = 48

d) 172 - (137 - x) = 93

137 - x = 172 - 93

137 - x = 79

x = 137 - 79

x = 58

e) 13. (x - 14) = 91

x - 14 = 91 : 13

x - 14 = 7

x = 14 + 7

x = 21

g) (13 - x).17 = 51

13 - x = 51 : 17

13 - x = 3

x = 13 - 3

x = 10

chúc bn học giỏi ^^ !

ok mk nha!! ! 5654645645767676576558578779769675634636457567687689978978978978766876765657886567567

1.19+(x-23)=50

<=>x-23=50-19

<=>x-23=31

<=>x=31+23

<=.x=54

vậy x=54

a) x - 7 = 5. 0 => x - 7 = 0 =>x = 7.

b) x: 3 = 47 +13 => x: 3 = 60 => x = 60.3 => x = 180.

c) x :  7 - 7 = 0 hoặc x : 12 - 12 = 0. Do đó x = 49 hoặc x = 144.

d) x : 2 = 150 - 135 => x: 2 = 15 => x = 15.2 => x = 30.

e) 100: x = 140 -120 => 100: x = 20 => x = 100:20 => x = 5.

g) x : 5 = 300 - 273 => x : 5 = 27 =>x = 27.5 => x = 135

a) x - 7 = 5. 0 => x - 7 = 0 =>x = 7.

b) x: 3 = 47 +13 => x: 3 = 60 => x = 60.3 => x = 180.

c) x :  7 - 7 = 0 hoặc x : 12 - 12 = 0. Do đó x = 49 hoặc x = 144.

d) x : 2 = 150 - 135 => x: 2 = 15 => x = 15.2 => x = 30.

e) 100: x = 140 -120 => 100: x = 20 => x = 100:20 => x = 5.

g) x : 5 = 300 - 273 => x : 5 = 27 =>x = 27.5 => x = 135

           Bài làm :

\(a\text{)}...\Leftrightarrow\orbr{\begin{cases}x\div7-7=0\\x.3-12=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x\div7=7\\x.3=12\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=49\\x=4\end{cases}}\)

\(b\text{)}\Leftrightarrow...\Leftrightarrow x\div2=15\Leftrightarrow x=15.2=30\)

\(c\text{)}...\Leftrightarrow100\div x=20\Leftrightarrow x=100\div20=5\)

\(d\text{)}...\Leftrightarrow x\div5=27\Leftrightarrow x=27.5=135\)

Giải

Bài 1

\(1,a,-40-37-\left(-29\right)\\ =-40-37+29\\ =-77+29=-48\\ b,27+\left(-36\right)-\left(-45\right)=27-36+45\\ =-9+45\\ =36\\ c,-125-\left[\left(-18\right)-125\right]\\ =-125+18+125\\ =\left(-125+125\right)+18\\ =18\\ d,140+\left[\left(-184\right)-140\right]\\ =140-184-140\\ =\left(140-140\right)-184\\ =0-184\\ =-184\)

Bài 2 

\(a,x-\left(-15\right)=-8\\ =>x+15=-8\\ =>x=-8-15\\ =>x=-23\\ b,-40-x=-35\\ =>x=\left(-40\right)-\left(-35\right)\\ =>x=-40+35\\ =>x=-5\\ c,x+\left(-50\right)=-27\\ =>x-50=-27\\ =>x=-27+50\\ =>x=23\)

1, Thực hiện phép tính:

\(a,-40+\left(-37\right)-\left(-29\right)=-77-\left(-29\right)=-48\)

\(b,27+\left(-36\right)-\left(-45\right)=-9-\left(-45\right)=36\)

\(c,-125-\left[\left(-18\right)-125\right]=-125-\left(-143\right)=18\)

\(d,140+\left[\left(-184\right)-140\right]=140+\left(-324\right)=-184\)

2, Tìm x biết:

\(a,x-\left(-15\right)=-8\)

\(x=-8+\left(-15\right)\)

\(x=-23\)

\(b,-40-x=-35\)

\(x=-40-\left(-35\right)\)

\(x=-5\)

\(c,x+\left(-50\right)=-27\)

\(x=-27-\left(-50\right)\)

\(x=23\)

x - 120 + 50 = 140

x - 120 = 140 + 50

x - 120 = 190

         x = 190 - 120

         x = 70

x - 120 + 50 = 140

x - 120 = 140 - 50

x - 120 = 90

x = 90 + 120

x = 210

bạn làm sai rồi

x : 60 = 273

x = 273×60

x = 16380

Vậy x = 16380.

Đáp án A

a) Do x chia hết cho 40 và chia hết cho 50 nên:

\(x\in BC\left(40,50\right)\)

Ta có:

\(B\left(40\right)=\left\{0;40;80;120;160;200;240;280;320;360;400;440;480;520;..\right\}\)

\(B\left(50\right)=\left\{0;50;100;150;200;250;300;350;400;450;500;550...\right\}\)

\(\Rightarrow BC\left(40,50\right)=\left\{0;200;400;600;...\right\}\)

Mà: \(x< 500\)

\(\Rightarrow x\in\left\{0;200;400\right\}\) 

b) A chia hết cho 140 và A chia hết cho 350 nên:

\(\Rightarrow A\in BC\left(140,350\right)\)

Ta có: 

\(B\left(140\right)=\left\{0;140;280;420;560;700;840;980;1120;1260;1400;1540\right\}\)

\(B\left(350\right)=\left\{0;350;700;1050;1400;1750;...\right\}\)

\(\Rightarrow BC\left(140;350\right)=\left\{0;700;1400;...\right\}\)

Mà: \(1200< A< 1500\)

\(\Rightarrow A\in\left\{1400\right\}\)