a)2,5*16,27*4=(2,5*4)*16,27=10*16,27=162,7.

b)0,25*1,25*4*8=(0,25*4)*(1,25*8)=1*10=10.

d)3/4*4/5+5/6*6/7*7/8=3*4/4*5+5*6*7/6*7*8=3/5+5/8=49/40.

a) 2,5 x 16,27 x 4

= (2,5 x 4) x 16,27

= 10 x 16,27

= 162,7

b) 0,25 x 1,25 x 4 x 8

= (0,25 x 4) x (1,25 x 8)

= 1 x 10

= 10

c) 6,7 x 9,55 + 9,45 x 16,7 + 16,7

= 6,7 x 9,55 + (9,45 + 1) x 16,7

= 6,7 x 9,55 + 10,45 x 16,7

= 63,985 + 174,515

= 238,5

d) 3/4 x 4/5 + 5/6 x 6/7 x 7/8

= 3/4 x 4/5 + 5/6 x 3/4

= 3/4 x (4/5 + 5/6)

= 3/4 x 49/30

= 49/40

36.4+36+7.36-2.36

=36.(4+1+7-2)

=36.10

=360

36x4+36+7x36-2x36

= 36x4+36x1+7x36-2x36

= 36x( 4+1+7-2)

=36x 10

= 360

36.4 + 36 + 7.36 - 2.36

= 36.4 + 36.1 + 7.36 - 2.36

= 36.(4 + 1 + 7 - 2)

= 36.(5 + 7 - 2)

= 36.(12 - 2)

= 36.10

= 360

\(\frac{114.18}{82.27}=\frac{2.3.19.2.9}{2.41.3.9}=\frac{19.2}{41}=\frac{38}{41}\)

Dấu chấm là dấu nhân nha bạn

Ai đi qua thấy đúng k nha

\(\frac{144.18}{82.27}=\frac{2.3.4.7.3.3.2}{2.41.3.3.3}=\frac{2.7.4.2}{41}=\frac{112}{41}\)

Thế là xong rồi đó

Bạn xem cách làm đi nha

\(\frac{144.18}{82.27}=\frac{2^2.6^2.2.3^2}{2.41.3^3}=\frac{2^3.2^2.3^2.3^2}{2.41.3^3}=\frac{2^5.3^4}{2.41.3^3}=\frac{2^4.3}{41}=\frac{48}{41}\)

Ta có:

   36,4 x 99 + 36 + 0,4

= 36,4 x 99 + (36 + 0,4)

= 36,4 x 99 +       36,4

= 36,4 x 99 + 36,4 x 1

= 36,4 x (99 + 1)

= 36,4 x     100

=         3640

36,4x99+36+0,4=36,4x99+36,4=36,4x(99+1)=36,4x100=3640

36, 4 x 99 + 36 + 0, 4

= 36 + 0,4 x 99 + 36 + 0,4 x 1

= (36 + 0,4) x (99+1)

= 36,4 x 100

= 3640

68-27 phần41

tích mk nha bạn

\(\frac{68\cdot35-27}{34\cdot68+41}\)

\(=\frac{68\left(34+1\right)-27}{34\cdot68+41}\)

\(=\frac{68\cdot34+68-27}{34\cdot68+41}\)

\(=\frac{1+41}{1+41}\)

\(=1\)

=\(\frac{2380-27}{2312+41}\)

=\(\frac{2352}{2352}\)

=1

Bằng 96 nha

a)

 \(\frac{{28}}{9} \cdot 0,7 + \frac{{28}}{9} \cdot 0,5 = \frac{{28}}{9}.\left( {0,7 + 0,5} \right)\)

b)

\(\begin{array}{l}\frac{{36}}{{13}}:4 + \frac{{36}}{{13}}:9\\ = \frac{{36}}{{13}}.\frac{1}{4} + \frac{{36}}{{13}}.\frac{1}{9}\\ = \frac{{36}}{{13}}.\left( {\frac{1}{4} + \frac{1}{9}} \right)\\ = \frac{{36}}{{13}}.\frac{{13}}{{36}} = 1\end{array}\)

 \(\begin{array}{l}\frac{{36}}{{13}}:(4 + 9)\\ = \frac{{36}}{{13}}:13\\ = \frac{{36}}{{13}}.\frac{1}{{13}}\\ = \frac{{36}}{{169}}\end{array}\)

Suy ra \(\frac{{36}}{{13}}:4 + \frac{{36}}{{13}}:9\) \( \ne \) \(\frac{{36}}{{13}}:(4 + 9)\).