x +1500=1500 +500

x +1500=2000

  x =2000-1500

  x =500 ai k mk mk k lai sieu hua

x + 1500 = 1500 + 500

x + 1500 = 2000

x             = 2000 - 1500

x             = 500        

Đáp số : 500 nha

3000

2730

Có cần giải chi tiết k

A, 500 + ( 500 x 2) + 1500

= 500 + 1000 + 1500

= 1500 + 1500 = 3000.

a) =500 + 1000 + 1000+500

=500+500+1000+1000= 1000+2000=3000

b) 30+ 3600+900

= ..??

1) 2x - 378 = 122

=> 2x = 122 + 378

=> 2x = 500

=> x = 500 : 2

=> x = 250

2) 8x - 4x = 1208

=> 4x = 1208

=> x = 1208 : 4

=> x = 302

3) x - 382 = 159 : 3

=> x - 382 = 53

=>  x = 53 + 382

=> x = 435

4) 3x + 30 = 420

=> 3x = 420 - 30

=> 3x = 390

=> x = 390 : 3

=> x = 130

5) 12x  - 13x - 500 = 1500

=> -x = 1500 + 500

=> -x = 2000

=> x = -2000

1,\(2x-378=122\)

\(2x=122+378\)

\(2x=500\)

\(x=500:2\)

\(x=250\)

2,\(8x-4x=1208\)

\(x.\left(8-4\right)=1208\)

\(x.4=1208\)

\(x=1208:4\)

\(x=302\)

3,\(x-382=159:3\)

\(x-382=53\)

\(x=52+382\)

\(x=434\)

4,\(3x+30=420\)

\(3x=420-30\)

\(3x=390\)

\(x=390:3\)

\(x=130\)

5,\(12x-13x-500=1500\)

như câu 2 

\(1,2x-378=122\)\(\Rightarrow2x=500\Rightarrow x=250\)

\(2,8x-4x=1208\)\(\Rightarrow4x=1208\Rightarrow x=302\)

\(3,x-382=159\div3\)\(\Rightarrow x-382=53\Rightarrow x=435\)

\(4,3x+30=402\)\(\Rightarrow3x=372\Rightarrow x=124\)

\(5,12x-13x-500=1500\)\(\Rightarrow-x-500=1500\Rightarrow-x=1000\Leftrightarrow x=-1000\)

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: \(1200< A< 1500\)

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

đáp số 3000

130 + 870 - 500 + 1500

= 1000 - 5000 + 1500

= 500 + 1500

= 2000

=2000

ai tk mk

mk tk lại

mk hứa

yên tâm

dư 1500