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![](https://rs.olm.vn/images/avt/0.png?1311)
341*67+341*16+659*83
=341*(67+16)+659*83
=341*83+659*83
=89*(341+659)
=89*1000
=89000
![](https://rs.olm.vn/images/avt/0.png?1311)
341 x 67 + 341 x 16 + 659 x 83
= 341 x (67 + 16) + 659 x 83
= 341 x 83 + 659 x 83
= (341 + 659) x 83
= 1000 x 83
= 83000
![](https://rs.olm.vn/images/avt/0.png?1311)
341 x 67 + 371 x 16 + 659 x 83
= 22847 + 5936 + 54697
= 83480
![](https://rs.olm.vn/images/avt/0.png?1311)
341×67+341×16+65×83
=341×(67+16)+65×83
=341×83+65×83
=(341+65)×83
=406×83
=33698
k mik nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(341\times67+341\times16+659\times83=\left[341\times\left(67+16\right)\right]+659\times83\)
\(=341\times83+659\times83=83\times\left(341+659\right)=83\times1000=83000\)
b)\(30\%\times x+x=52\Rightarrow\frac{3}{10}\times x+x=52\Rightarrow x\times\left(\frac{3}{10}+1\right)=52\)
\(\Rightarrow x\times1,3=52\Rightarrow x=52:1,3\Rightarrow x=40\)
c)\(75\%\times x+\frac{3}{4}\times x+x=30\Rightarrow\frac{3}{4}\times x+\frac{3}{4}\times x+x=30\Rightarrow x\times\left(\frac{3}{4}+\frac{3}{4}+1\right)=30\)
\(\Rightarrow x\times\frac{5}{2}=30\Rightarrow x=30:\frac{5}{2}\Rightarrow x=12\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{67}{77}\)và \(\frac{77}{83}\) MSC : 6391
\(\frac{67\cdot83}{77\cdot83}=\frac{5561}{6391}\)
\(\frac{77\cdot77}{83\cdot77}=\frac{5929}{6391}\)
\(\Rightarrow\frac{67}{77}< \frac{77}{83}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 - 67/77 = 10/77 ; 1 - 73/83 = 10/83
Vì 10/77 > 10/83 nên 67/77 > 73/83
![](https://rs.olm.vn/images/avt/0.png?1311)
\(77+54+967+946+5033=\left(967+5033\right)+\left(946+54\right)+77=6000+1000+77=7077\)
\(341.67+341.16+659.83=341\left(67+16\right)+659.83=341.83+659.83=83\left(341+659\right)=83.1000=83000\)
b: Ta có: \(341\cdot67+341\cdot16+659\cdot83\)
\(=341\cdot83+659\cdot83\)
=83000