a, 35600 : 25 : 4 = (35600 : 4) : 25 = 8900 : 25 = 356

b, 359 x 47 – 259 x 47 = (359 – 259) x 47 = 100 x 47 = 4700

a, 35600 : 25 : 4

= 35600 : ( 25 . 4 )

= 35600 : 100

= 356

b, 359 . 47 - 259 . 47

= 47 . ( 359 - 259 )

= 47 . 100

= 4700

a, \(\frac{2}{5}\)x ( \(\frac{3}{7}\)+\(\frac{4}{7}\))

= \(\frac{2}{5}\)x  \(\frac{7}{7}\)

= \(\frac{2}{5}\)x 1

= \(\frac{2}{5}\)

b, \(\frac{47}{19}\) :\(\frac{15}{32}\) - \(\frac{47}{19}\) :\(\frac{15}{17}\)
= \(\frac{47}{19}\) × \(\frac{32}{15}\) - \(\frac{47}{19}\) × \(\frac{17}{15}\)
= \(\frac{47}{19}\) × (\(\frac{32}{15}\)-\(\frac{17}{15}\))
= \(\frac{47}{19}\) × 1
= \(\frac{47}{19}\)

a, 2.9.5.7.4.25=(2.5).(25.4).(7.9)

=10.100.63=63000

câu b làm tương tự tích giúp mình nha

a.  2 5 + 3 7 + 3 5 + 4 7 = 2 5 + 3 5 + 3 7 + 4 7 = 5 5 + 7 7 = 1 + 1 = 2

b.  2 3 × 4 9 + 2 3 × 5 9 = 2 3 × 4 9 + 5 9 = 2 3 × 9 9 = 2 3 × 1 = 2 3

=47 x (52+49-1)=47x 100= 4700

47 x 52 + 47 x 49 - 47

= 47 x 52 + 47 x 49 - 47 x 1

= 47 x (52+49-1)

= 47 x 100

= 4700

4700 kết quả học t

47.63 = (55 - 8)(55 + 8)

= 55² - 8²

= 3025 - 64

= 2961

--------

47.(63 - 15) - 63.(47 - 15)

= 47.63 - 47.15 - 63.47 + 63.15

= 47.(63 - 63) + 15.(63 - 47)

= 47.0 + 15.16

= 0 + 240

= 240

47.63 = (55 - 8)(55 + 8)

= 55² - 8²

= 3025 - 64

= 2961

--------

47.(63 - 15) - 63.(47 - 15)

= 47.63 - 47.15 - 63.47 + 63.15

= 47.(63 - 63) + 15.(63 - 47)

= 47.0 + 15.16

= 0 + 240

= 240

` 10000 – 47 xx 72 – 47 xx 28 `
`=10000-47xx(72+28)`
`=10000-47xx100`
`=100xx100-47xx100`
`=100xx(100-47)`
`=100xx53`
`=5300`

`10 000 - 47 xx 72 - 47xx28`

`=10 000 - 47 xx(72+28)`

`=10 000 - 47xx100`

`=10 000 - 4700`

`=5300`

 10000 – 47 x 72 + 47 x 28 

=10000-(47x(72+28)

=10000-4700

=5300

43 x 53 + 47 x 196 - 47 x 52

= 43 x 53 + 47 x ( 196 - 52 )

= 43 x 53 + 47 x 144 _{-> Hết thuận tiện rồi bạn ơi ( kiểm tra lại bài thử nha ).}

bruh

=))) Chịu thoai.

=(2,54 giờ+0,46 giờ) x 4

= 3 giờ x 4

=12 giờ

12 giờ

4x(2,54 giờ+0,46 giờ)=4x3=12