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1201 > 999 24 601 > 2461
43 658 <43 690 138 579 < 138 701
5178 = 5100 + 78 520 000 > 419 999
![](https://rs.olm.vn/images/avt/0.png?1311)
1,
=66
2,
=28
3,
=2016+450-2016
=450
4,
=360-360+111
=111
5,
=1972-638-972
=1972-972-638
=362
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{56}{78}\)\(=\)\(\frac{56.27}{78.27}\)\(=\)\(\frac{1512}{2106}\)
\(\frac{43}{27}\)\(=\)\(\frac{43.78}{27.78}\)\(=\)\(\frac{3354}{2106}\)
\(D\text{ấu}\)\(ch\text{ấm}\)\(ngh\text{ĩa}\)\(l\text{à}\)\(d\text{ấu}\)\(nh\text{â}n\).
tk nha bạn !
Mẫu số chung là 78x27=2106
\(\frac{56}{78}=\frac{56x27}{78x27}=\frac{1512}{2106}\)
\(\frac{43}{27}=\frac{43x78}{27x78}=\frac{3354}{2106}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 42 x 43 + 43 x 57 + 43 ) - 360 : 4
= 43 x ( 42 + 57 + 1 ) - 90
= 43 x 100 - 90
= 4300 - 90
= 4210
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
41 + 42 + 43 + 44 + 45 + 46 + 47 + 48 + 49
=(49+41).[(49-41):2] +45
=90.4+45
=360+45
=405
![](https://rs.olm.vn/images/avt/0.png?1311)
326 x 78 + 327 x 22
= 326 x 78 + (326 + 1) x 22
= 326 x 78 + 326 x 22 + 1 x 22
= 326 x (78 + 22) + 22
= 326 x 100 + 22
= 32600 + 22
= 32622
![](https://rs.olm.vn/images/avt/0.png?1311)
289 x 57 + 311 x 45 + 289 x 43 + 311 x 55
= 289 x ( 57 + 43 ) + 311 x ( 45 + 55 )
= 289 x 100 + 311 x 100
= ( 289 + 311 ) x 100
= 600 x 100
= 60000
\(289x57+311x45+289x43+311x55\)\(=289x\left(57+43\right)+311x\left(45+55\right)\)
\(=289x100+311x100=100x\left(289+311\right)\)\(=100x600=60000\)
\(43.22+78.43=43\left(22+78\right)\)
\(=43.100\)
\(=4300\)
\(43\cdot22+78\cdot43\)
\(=43\cdot\left(22+78\right)\)
\(=43\cdot100\)
\(=4300\)