hong ai giúp mik dọ? ;-;

= 2430 bạn nha

525 *4 + 25 / 5 - 4 * [ 30 - 5 ] - 5 + 5 * 2 = 2430

trả lời rõ đi bạn

 \(\frac{6}{5}\)x \(\frac{3}{8}\)+ \(\frac{5}{8}\)x \(\frac{6}{5}\)- \(\frac{4}{5}\)

= \(\frac{6}{5}\)x (\(\frac{3}{8}\)+ \(\frac{5}{8}\)) - \(\frac{4}{5}\)

=\(\frac{6}{5}\)x 1 - \(\frac{4}{5}\)

=\(\frac{6}{5}\)- \(\frac{4}{5}\)

=\(\frac{2}{5}\)

\(\dfrac{4}{5}\times\left(\dfrac{5}{6}+\dfrac{2}{12}\right)=\dfrac{4}{5}\times\left(\dfrac{10}{12}+\dfrac{2}{12}\right)=\dfrac{4}{5}\times\dfrac{12}{12}=\dfrac{4}{5}\times1=\dfrac{4}{5}\times\dfrac{1}{1}=\dfrac{4}{5}\)

\(=\dfrac{5}{6}\times\dfrac{4}{5}+\dfrac{4}{5}\times\dfrac{1}{6}=\left(\dfrac{5}{6}+\dfrac{1}{6}\right)\times\dfrac{4}{5}=\dfrac{6}{6}\times\dfrac{4}{5}=1\times\dfrac{4}{5}=\dfrac{4}{5}\)

   5/6 x 4/5 + 4/5 x 2/12

= 4/5 x (5/6 + 2/12)

= 4/5 x (10/12 + 2/12)

= 4/5 x 1

= 4/5

2/5 x 3 + 2/5 x 6 + 2/5

= 2/5 x (3+6+1)

=2/5 x 10

= 20/5=4

`2/5 xx 3 + 2/5 xx 6 +2/5`

`= 2/5 xx 3 + 2/5 xx 6 +2/5 xx1`

`= 2/5xx(3+6+1)`

`= 2/5 xx 10`

`= 20/5`

`=4`

2/5 x 3+2/5x6+2/5

=2/5x\(\left(3+6\right)\)+2/5

=2/5x9+2/5

=2/5x\(\left(9+1\right)\)

=2/5x10

=4

(4⁵ x 10 x 5⁶ + 25⁵ x 2⁸):(2⁸ x 5⁴ + 5⁷ x 2⁵)=1000

Lưu ý : 

Nếu không đủ các bước trên thì sẽ không được tính là làm đúng !

a)   4 x 2 + 4 x 3 + 4 x 4 + 4 

   = 4 x ( 2 + 3 + 4 + 1 )

   = 4 x 10

   = 40

b)   5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5

   = 5 x ( 23 - 2 - 3 - 4 - 5 + 5 )

   = 5 x 14

   = 70

a)4x(1+2+3+4)

=4x10

=40

b)5x23—5x2—5x3—5x4—5x5+5

=5x(23—2—3—4—5+1)

=5x10

=50

a) 4 x 2 x 4 x 3 + 4 x 4 + 4

= 4 x ( 1 + 2 + 3 + 4 )

= 4 x 10

= 40

b) 5 x 23 - 5 x 2 - 5 x 3 - 5 x 4 - 5 x 5 + 5

= 5 x ( 23 - 2 - 3 - 4 - 5 + 1 )

= 5 x 10

= 50

Đ/s: ... 

10 x 5 + 10 + 5 + 10 x 5

= (5 + 5) x 10 + 10 + 5

=    10 x 10 + 10 + 5

=        100 + 10 + 5

=              115

k mik

10 x 5 + 10 + 5 + 10 x 5

= 50 + 15 + 50

= (50 + 50) + 15

= 100 + 15

= 115

10 x 5 + 10 + 5 + 10 x 5

= (5 + 5) x 10 + 10 + 5

=    10 x 10 + 10 + 5

=        100 + 10 + 5

=              115