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47,5 * 0,5 * 4
= 47,5 * ( 0,5 * 4 )
= 47,5 * 2
= 95
4 * 6,58 * 2,25
= 6,58 * ( 2,25 * 4 )
= 6,58 * 9
= 59,22
1,25 * 2 * 13,8 * 4
= ( 1,25 * 4 ) * ( 13,8 * 2 )
= 5 * 27,6
= 138
47,5.0,5.4
=47,5.(0,5.4)
=47,5.2
=95
4.6,58.2.25
=(4.2,25).6,58
=9.6,58
=59,22
1,25.2.13,8.4
=(1,25.4.2).13,8
=10.13,8=138
k mk nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 13,8 x 4,21 + 4,21 x 22,2
= 4,21 x (13,8 + 22,2)
= 4,21 x 36
= 151,56
b. = 5,6 x ( 40,7 - 18,7)
= 5,6 x 22
= 123,2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\dfrac{7}{9}-\dfrac{2}{7}+\dfrac{2}{3}+\dfrac{4}{7}\\ =\left(\dfrac{7}{9}+\dfrac{6}{9}\right)+\left(\dfrac{4}{7}-\dfrac{2}{7}\right)\\ =\dfrac{13}{9}+\dfrac{2}{7}\\ =\dfrac{109}{63}\\ b,13,8+7-5,25+4,25\\ =\left(13,8+7\right)-\left(5,25-4,25\right)\\ =20,8-1\\ =19,8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
= 5,65 x (13,8 + 21,9) + 35,7 x (3,21 + 1,14)
= 5,65 x 35,7 + 35,7 x 4,35
= 35,7 x (5,65 + 4,35) = 35,7 x 10 = 357
= 5,65 x (13,8 + 21,9) + 35,7 x (3,21 + 1,14)
= 5,65 x 35,7 + 35,7 x 4,35
= 35,7 x (5,65 + 4,35) = 35,7 x 10 = 357
k mk nha $_$
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
TK
13,25:0,5+13,25:0,25+13,25:0,125
=13,25:(0,5+0,25+0,125)
=13,25:0,875
=15,142...
\(13,8:0,5+13,8:0,25+13,8:0,125\)
\(=13,8\times2+13,8\times4+13,8\times8\)
\(=13,8\times\left(2+4+8\right)\)
\(=13,8\times14\)
\(=193,2\)
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