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![](https://rs.olm.vn/images/avt/0.png?1311)
24 x 62 + 48 x 19
=24 x 62 + 24 x 2 x 19
=24 x ( 62 + 2 x 19)
= 24 x ( 62 +38)
= 24 x 100
= 2400
24X62+48X19
=24X62+(24X2)X19
=24X62+24X(2X19)
=24X62+24X38
=24X(62+38)
=24X100=2400
![](https://rs.olm.vn/images/avt/0.png?1311)
A = 2013 x 2012 - 1997
A = ( 2013 x 2012 ) - 1997
A = 4050156 - 1997
A = 4048159
B = 2012 x 2011 + 2015
B = ( 2012 x 2011 ) + 2015
B = 4046132 + 2015
B = 4048147
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\dfrac{5}{4x7}+\dfrac{5}{7x10}+...+\dfrac{5}{25x28}+\dfrac{5}{28x31}\)
\(\dfrac{3}{5}A=\dfrac{7-4}{4x7}+\dfrac{10-7}{7x10}+...+\dfrac{28-25}{25x28}+\dfrac{31-28}{28x31}\)
\(\dfrac{3}{5}A=\dfrac{7}{4x7}-\dfrac{4}{4x7}+\dfrac{10}{7x10}-\dfrac{7}{7x10}+...+\dfrac{28}{25x28}-\dfrac{25}{25x28}+\dfrac{31}{28x31}-\dfrac{28}{28x31}\)
\(\dfrac{3}{5}A=\dfrac{1}{4}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{10}+...+\dfrac{1}{25}-\dfrac{1}{28}+\dfrac{1}{28}-\dfrac{1}{31}\)
\(\dfrac{3}{5}A=\dfrac{1}{4}-\dfrac{1}{31}=\dfrac{27}{124}\)
\(A=\dfrac{27}{124}:\dfrac{3}{5}=\dfrac{27}{124}x\dfrac{5}{3}=\dfrac{45}{124}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 24,75x12,6+4,56x10
= 311,85 + 45,6
= 357,45
b)
= (8x1,25) x (3,5x3)
= 10 x 10,5
= 105
nếu đúng thì tick hộ mik nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
a + c x b x a x b=26+ 102,2 x 16,2 x 26 x 16,2=26+697355,568=697381,568
a+ c x b x a x b= a x(1+c x b x b)=26 x (1+102,2+16,2 x 16,2)=26 x 365 , 64=9506,64
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=2,53\times17+17,67\times15+2,53\times83+17,67\times85\)
\(A=2,53\times17+2,53\times83+17,67\times15+17,67\times85\)
\(A=2,53\times\left(17+83\right)+17,67\times\left(15+85\right)\)
\(A=2,53\times100+17,67\times100\)
\(A=253+1767\)
\(A=2020\)
a,
146x273+437x273+273z418-273
273 x (146+737+418-1)
273 x1000=273000
b.43x37+43x73+57x66+57x44
= 43 x (37+73) + 57x (66+44)
= 43 x 110 + 57 x 110
= 110 x(43+57)
=110x100
=11000
a)146x273+437x273+273z418-273
273 x (146+737+418-1)
273 x1000=273000
b)43x37+43x73+57x66+57x44
= 43 x (37+73) + 57x (66+44)
= 43 x 110 + 57 x 110
= 110 x(43+57)
=110x100
=11000
hok tốt