=(1/11 + 4/11) + (3/4 + 1/4)

=5/11 + 4/4

=5/11+1

=5/11+ 11/11

=16/11

\(\frac{1}{11}+\frac{3}{4}+\frac{4}{11}+\frac{1}{4}\)

\(=\left(\frac{1}{11}+\frac{4}{11}\right)+\left(\frac{3}{4}+\frac{1}{4}\right)\)

\(=\frac{5}{11}+1\)

\(=1\frac{5}{11}\)

1/11+3/4+4/11+1/4

=(1/11+4/11)+(3/4+1/4)

=5/11+1

=16/11

\(a,=199,8\times\left(998+1+1\right)=199,8\times100=19980\)

\(b,=\left(0,5\times0,2\right)\times\left(0,25\times4\right)=0,12\times1=0,12\)

\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{21.11.2.4.17}{11.17.3.21}=\frac{\left(21.11.17\right).\left(2.4\right)}{\left(11.17.21\right).3}=\frac{2.4}{3}=\frac{8}{3}\)

\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{5.7.13.2}{7.2.13.5.5}=\frac{5.7.13.2}{5.7.13.2.5}=\frac{2}{2.5}=\frac{1}{5}\)

(20,1*20,2 + 28,3 *12,4 ) * (11*9 -900*0.1-9)

=(20,1 *20,2 +28,3 *12.4)*(99-90-9) 

=20,1* 20,2 +28,3 *12,4 )*0 

=0

Cần gấp thì bằng 202000 nhé! K cho mình

2020x45+2020x54+2020

=2020x45+2020x54+2020x1

=2020x(45+54+1)

=2020x100

=202000

12/25+13/25-1

=25/25-1

=1-1

=0

12/25+13/25-1

=25/25-1

=1-1

=0

\(25\times32\times125\times15\\=(25\times4)\times(8\times125)\times15\\=100\times1000\times15\\=100000\times15\\=1500000\)

25 x 32 x 125 x 15 

=(125 x 32 ) x (25 x 15 )

= 4000 x 375

=1 500 000

\(25\times32\times125\times15\)

\(=25\times4\times8\times125\times15\)

\(=\left(25\times4\right)\times\left(8\times125\right)\times15\)

\(=100\times1000\times15\)

\(=\left(1000\times15\right)\times100\)

\(=15000\times100=1500000\)

14,5 x 89,55 +2 x 9,45 x 7,25 + 14,5

= 14,5 x 89,55 + 2 x 7,25 x 9,45 + 14,5 x 1

= 14,5 x 89,55 + 14,5 x 9,45 + 14,5 x 1

= 14,5 x ( 89,55 + 9,45 + 1 )

= 14,5 x 100

= 1450

~ HOK TỐT ~

12,35 + 1,42 - 11,35 + 8,58

= (12,35 - 11,35) + (1,42 + 8,58)

= 1 + 10

= 11

12,35 + 1,42 - 11,35 + 8,58 
= 12,35 + (1,42 - 11,35 ) + 8,58 
= 12,35 - 9,93 + 8,58 
= 2,42 + 8,58 
= 11