2 x 4 x 5 x 6 x 15 x 25

= (2x5)x(6x15)x(4x25)

= 10 x 90 x 100

= 90000

2x4x5x6x15x25

=[2x5]x[4x25]x[6x15]

=10x100x90

=1000x90

=90000

h cho minh do ha

\(108\times5+108\times96-108=108\times\left(5+96-1\right)\)

                                                              \(=108\times100=10800\)

`108xx5+108xx96-108`

`=108xx(5+96-1)`

`=108xx100`

`=10800`

= 4/5 x ( 3/7 + 6/7 - 4/14 )

= 4/5 x ( 3/7 + 6/7 - 2/7 )

= 4/5 x 7/7

= 4/5

\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times\frac{5}{6}\)

\(=\frac{2\times3\times4\times5}{3\times4\times5\times6}\)

\(=\frac{2}{6}\)

\(=\frac{1}{3}\)

??????

= 4 x 25 x5

= 100 x 5

=500

4 x 5 x 25

=20 x 25

=500

1/3 x ( 4/5+1/5)

=1/3 x 1

=1/3

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

= 1/3 x 1

= 1/3

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

(lưu ý dấu . là x nhân ý)

Chúc bạn học tốt!^_^

Giải:

150 x\(\frac{4}{3}\):15 + 5 x \(\frac{4}{3}\)- 10 x \(\frac{4}{3}\)

= (150 : 15 + 5 - 10) x \(\frac{4}{3}\)

= (10 + 5 - 10) x \(\frac{4}{3}\)

= 5 x \(\frac{4}{3}\)

= \(\frac{20}{3}\)

Chúc bạn học tốt nhé.

`4/5 xx 3/7 + 4/5 xx 6/7 - 4/5 xx 4/14`

`= 4/5 xx ( 3/7 + 6/7-4/14)`

`= 4/5 xx 1`

`= 4/5`