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525 : x + 700 : x = 7
( 525 + 700 ) : x = 7
1225 : x = 7
x = 1225 : 7
x = 175
Nhớ tick cho mik nha !!!
525:x+700:x=7
(525+700):x=7
1225:x=7
x=1225:7
x=175
tick nha
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
525 : x + 700 : x = 7
( 525 + 700 ) : x = 7
1225 : x = 7
x = 1225 : 7
x = 175
Bấm đúng cho mik nha !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
X : 525 + 700 : X = 7
<=> ( 525 + 700 ) : X = 7
<=> 1225 :x = 7
<=> x= 1225/7
<=> x=175
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 47 000 + 8 000 + 3 000 = (47 000 + 3 000) + 8 000
= 50 000 + 8 000
= 58 000
250 000 – 5 x 10 000 = 250 000 – 50 000
= 200 000
20 x 3 x 5 x 7 = (3 x 7) x (20 x 5)
= 21 x 100
= 2 100
b) (3 075 – 75) : 3 = 3 000 : 3
= 1 000
8 x (700 + 300) = 8 x 1 000
= 8 000
92 x 753 – 82 x 753 = 753 x (92 – 82)
= 753 x 10
= 7 530
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{525}{x}+\frac{700}{x}=7\Rightarrow\frac{1}{x}\left(525+700\right)=7\Rightarrow\frac{1}{x}=\frac{1}{175}\Rightarrow x=175\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\times27+x\times73=2700\\ x\times\left(27+73\right)=2700\\ x\times100=2700\\ x=27\)
\(\Leftrightarrow x\times\left(3+7\right)=700\\ \Leftrightarrow x\times10=700\\ \Leftrightarrow x=700:10\\ \Leftrightarrow x=70\)
\(x\times\)(3 + 7) = 700
\(x\times\) 10 = 700
\(x=700:10=70\)