7 x 5 x 36 + 35 x 42 + 35 x 22

= 35 x 36 +35 x 42 + 35 x 22

= 35 x ( 36 + 42 + 22 )

= 35 x 100 

= 3500

Ta co 7*5*36+35*42+35*22

=35*36+35*42+35*22

=35*(36+42+22)=35*100

=3500 cho minh

7 × 5 × 36 +35 × 42+ 35×22

= 35 x 36 + 35 x 42 + 35 x22

= 35 x(36 + 42 + 22)

=35 x 100

= 3500

\(\frac{9x56x49}{7x8x63}\)

= 9 x 7 x 7/ 7 x 8 x 63

=\(\frac{1x7x7}{1x1x63}\)

\(=\frac{49}{63}\)

\(=\frac{7}{9}\)

Xin lỗi vì đây là phân số có dấu gạch mờ nha

=9*9*6*7*7

----------------

7*8*9*7

=9*6*7

---------

8*7

=378

--------

63

=12000:12

=1000

480 x 25 : 12

= ( 480 : 12 ) x 25

= 40 x 25

= 1 000

1000

DS:11/5 DS: 10

7/11:3/5+4/11:3/5

=(7/11+4/11):3/5

=1:3/5

=1x5/3

=\(\frac{5}{3}\)

(6,24+1,26);0,75

=7,5:0,75

=10

\(\frac{7}{11}:\frac{3}{5}+\frac{4}{11}:\frac{3}{5}=\frac{3}{5}:\left(\frac{7}{11}+\frac{4}{11}\right)=\frac{3}{5}:1=\frac{5}{3}\)

\(\left(6,24+1,26\right):0,75=7,5:0,75=10\)

\(\frac{5}{4}+\frac{7}{12}+\frac{7}{5}+\frac{75}{100}+\frac{40}{25}+\frac{20}{48}\)

\(=\frac{5}{4}+\frac{7}{12}+\frac{7}{5}+\frac{3}{4}+\frac{8}{5}+\frac{5}{12}\)

\(=\left(\frac{5}{4}+\frac{3}{4}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)+\left(\frac{7}{5}+\frac{8}{5}\right)\)

\(=\frac{8}{4}+\frac{12}{12}+\frac{15}{5}\)

\(=2+1+3\)

\(=6\)

Đặt A=5/4 + 7/12 + 7/5 + 75/100 + 40/25 + 20/48

=>A=125/100 + 28/48 + 35/25 + 75/100 + 40/25 + 20/48

=>A=(125/100 + 75/100) + (28/48 + 20/48) + (35/25 + 40/25)

=>A=        2                     +            1             +           3

=>A=                    6

Vậy A=6