phần 1 = 24 x (31+42+27)=24 x 100=2400

phần 2 = (36 x (28+82)) + (64 x (69+41)) = (36x110) + (64x110) = 110 x (36+64) = 110x100=11000

=24*31+24*42+24*27

=24(31+42+27)

=24*100

=2400

\(2\times31\times12+4\times6\times42+8\times27\times3\)

\(=\left(2\times12\right)\times31+\left(4\times6\right)\times42+\left(8\times3\right)\times27\)

\(=24\times31+24\times42+24\times27\)

\(=24\times\left(31+42+27\right)\)

\(=24\times100\)

\(=2400\)

a, \(2.31.12+4.6.42+8.27.3=24.31+24.42+24.27=24.\left(31+42+27\right)=31.100=3100\)

b, \(36.38+36.82+64.69+64.41=36.120+64.110=11360\)

a)       \(2.31.12+4.6.42+8.27.3\)

\(=\)\(\left(2.12\right).31+\left(4.6\right).42+\left(8.3\right).27\)

\(=\)\(24.31+24.42+24.27\)

\(=\)\(24.\left(31+42+27\right)\)

\(=\)\(24.100\)

\(=\)\(2400\)

      \(36.38+36.82+64.69+64.41\)

\(=\)\(36.\left(38+82\right)+64.\left(69+41\right)\)

\(=\)\(36.120\)             \(+64.110\)

\(=\)\(4320\)                 \(+7040\)

\(=\)\(11360\)

a) 7,2 x 94,3 + 7,2 x 4,7 + 7,2

=7,2 x(94,3+4,7+1)

=7,2x100

=720

b)\(\dfrac{7}{9}\times\dfrac{2}{3}+\dfrac{7}{9}\times\dfrac{1}{3}=\dfrac{7}{9}\times\left(\dfrac{2}{3}+\dfrac{1}{3}\right)=\dfrac{7}{9}\times1=\dfrac{7}{9}\)

các bạn giúp mink với mink cầm gấp

a) 3/5 + 0,75 + 4/15+ 1/4 

= 3/5 + 3/4 + 4/15 + 1/4 

= ( 3/5 + 4/15 ) + ( 3/4 + 1/4 ) 

= ( 9/15 + 4/15 ) + 1 

= 13/15 + 1

= 28/15 

Cbht!!!!

a)3/5+0,75+4/15+1/4

=(3/5+4/15)+(3/4+1/4)

=13/15+1

=28/15

`a)1/10 + 2/10 + 3/10 + 4/10 + 5/10 + 6/10 + 7/10 + 8/10 + 9/10`

`=(1/10+9/10)+(2/10+8/10)+(3/10+7/10)+(4/10+6/10)+5/10`

`=10/10 + 10/10+10/10+10/10+1/2`

`=1+1+1+1+1/2`

`=2+2+1/2`

`=4+1/2`

`=8/2+1/2`

`=9/2`

__

`13,25:0,5+13,25:0,25+13,25:0,125+13,25×6`

`=13,25×1/(0,5)+13,25×1/(0,25)+13,25×1/(0,125)+13,25×6`

`=13,25×(1/(0,5)+1/(0,25)+1/(0,125)+6)`

`=13,25×(2+4+8+6)`

`=13,25×20`

`=265`

`#QiN`

\(a,3,47\times\dfrac{1}{2}-2,47:2+0,5=a,3,47\times\dfrac{1}{2}-2,47\times\dfrac{1}{2}+\dfrac{1}{2}=\dfrac{1}{2}\times\left(3,47-2,47+1\right)=\dfrac{1}{2}\times2=1\)