\(=\dfrac{11}{12}\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right)=\dfrac{11}{12}\cdot1=\dfrac{11}{12}\)

=11/12

11/12 nha

=125 x 12 +12 x 874 +12 x 1

=12x( 125 + 874 +1)

=12 x 1000

=12000

=12.(125+874+1)

=12.1000

=12000

125 x 12 + 12 x 874 + 12

= 12 x ( 125 + 874 + 1 )

= 12 x 1000

= 12000

=202,2*12-202,2*4+202,2*2

=202,2*10

=2022

2022

(5/12+7/12) nhân 4/7=4/7

hok tốt

\(\frac{4}{7}.\frac{5}{12}+\frac{4}{7}.\frac{7}{12}+\frac{4}{7}\)

\(=\frac{4}{7}.\left(\frac{5}{12}+\frac{7}{12}+1\right)\)

\(=\frac{4}{7}\left(\frac{12}{12}+1\right)\)

\(=\frac{4}{7}.2\)

\(=\frac{8}{7}\)

\(\frac{4}{7}\times\frac{5}{12}+\frac{4}{7}\times\frac{7}{12}+\frac{4}{7}\)

\(=\frac{4}{7}\times\frac{5}{12}+\frac{4}{7}\times\frac{7}{12}+\frac{4}{7}\times1\)

\(=\frac{4}{7}\times\left(\frac{5}{12}+\frac{7}{12}+1\right)\)

\(=\frac{4}{7}\times\left(\frac{12}{12}+1\right)\)

\(=\frac{4}{7}\times\left(1+1\right)\)

\(=\frac{4}{7}\times2=\frac{4}{7}\times\frac{2}{1}=\frac{8}{7}\)

(đúng thì k, sai thì thôi)

2/3*(5/12+7/12) +1/3 = 2/3*12/12+1/3

= 2/3+1/3= 1

có khác gì câu ở trên của Linh Nguyễn Channel đâu trời

=2/3 x ( 5/12 + 7/12 ) + 1/3 = 2/3 *1 +1/3 = 1

=2/3 . (5/12 + 7/12) +1/3

=2/3 . 1 + 1/3

=1

1 bạn nhé

30x25x7x8

=(30x7)x(25x8)

=210x200

=42000

75x8x12x14

=(75x12)x(8x14)

=900x112

=100800

A) =(30*7)*(25*8)

=210*200

=4200 

B)=(75*8)*(12*14)

=600*168
=100800

a)=4x25x7
   =100x7
   =700
b) =302x(19-9)
   =302x10
   =3020

  3/4 x 7/12 + 3/4 x 1/6 + 3/4 x 1/4

=3/4 x (7/12 + 1/6 + 1/4)

=3/4 x (7/12 + 2/12 + 3/12)

=3/4 x 1

=3/4

Chúc học tốt~

3/4x7/12+3/4x1/6+3/4x1/4=3/4x(7/12+1/6+1/4)=3/4x1=3/4

cam on