b, 4 x 0,75 x 2,5

= (4 x 2,5) x 0,75

= 10 x 0,75

= 7,5

A. 5 x 25,7-25,7+25,7 x 6

=25,7x(5+1-6)

=25,7x0

=0

B. 4 x 0,75 x 2,5

=(4 x 2,5)x0,75

=10 x 0,75

=7,5

 \(2,5\) x \(4+0,75\) x \(2,5\)

\(=2,5\) x \(\left(4+0,75\right)\)

\(=2,5\) x \(4,75\)

\(=11,875\)

=2.5:4/1+0.75x2.5=2.5x0.25+0.75x2.5=2.5(0.25+0.75)=2.5x1=2.5

xin loi = 2,5

2,5 : 4 + 0,75 x 2,5 

= 2,5 x 0,25 + 0,75 x 2,5

= 2,5 x (0,25 + 0,75)

= 2,5 x 1

= 2,5

Chúc bạn học tốt.

😁😁😁

nhiều thế

sfdhg 

a,0,12 x 300 = 36

b, 4,5 x 2,5  + 4,5 x 4,5 + 2,5 + 4,5 x 2 + 2

=  4,5 x 2,5  + 4,5 x 4,5 + 4,5 x 2 + (2,5 +2)

= 4,5 x 2,5  + 4,5 x 4,5 + 4,5 x 2  + 4,5

= 4,5 x 2,5 + 4,5 x 4,5 + 4,5 x 2 + 4,5 x 1 

= 4,5 x ( 2,5 + 4,5 + 2 + 1)

= 4,5 x ( 7 + 3)

= 4,5 x 10

= 45

\(a.0,12\times300\\ =0,12\times100\times3\\ =12\times3\\ =36\\ b.4,5\times2,5+4,5\times4,5+2,5+4,5\times2+2\\=4,5\times2,5+4,5\times4,5+4,5\times2+\left(2,5+2\right)\\ =4,5\times2,5+4,5\times4,5+4,5\times2+4,5\\ =4,5\times\left(2,5+4,5+2+1\right)\\ =4,5\times\left(7+3\right)\\ =4,5\times10\\ =45\)

#1q2w3e

0,75 x 95 + 1,5 x 2 +0,75

=0,75 x 95 + 0,75 x 2 x2 +0,75

=0,75 x 95 +0,75 x 4 +0,75

=0,75 x(95+4+1)

=0,75 x100

=75

653,6:0,125x5:8

=653,6x(5:0,125);8

=653,6x40:8

=653,6x(40:8)

=653,6 x 5

3260

0,75 x 95 + 1,5 x 2 + 0,75

= 0,75 x (95 + 1) + 1,5 x 2

= 0,75 x 96 + 1,5 x 2

= 0,75 x 64 x 1,5 + 1,5 x 2

= 48 x 1,5 + 1,5 x 2

= (48 + 2) x 1,5

= 50 x 1,5

= 75

653,6 : 0,125 x 5 : 8

= 653,6 x 8 x 5 : 8

= (653,6 x 5 ) x 8 : 8

= 3268 x 1

= 3268

đúng thì k mik nhé

Câu 1.=(95x2+1,5)x0,75

=191,5x0,75

=143,625

Câu 2.=(653,6:8):(0,125x5)

=81,7:0,625

=130,72

a) = (360 + 126 + 123) : 3 = 203

b) = (436 + 164 - 200) : 4 = 100

c) = (525 + 120 - 145) : 5 = 100

`39/16 : 5/8 - 7/16 : 5/8`

`=39/16 xx 8/5- 7/16 xx 8/5`

`=8/5 xx (39/16 - 7/16)`

`= 8/5 xx2`

`= 16/5`

__

` 4/3 xx 9/8 - 4/3 xx 3/8`

`=4/3 -(9/8 - 3/8)`

`= 4/3 xx 3/4`

`=1`

\(a,\\ \dfrac{39}{16}:\dfrac{5}{8}-\dfrac{7}{16}:\dfrac{5}{8}\\ =\dfrac{39}{16}\cdot\dfrac{8}{5}-\dfrac{7}{16}\cdot\dfrac{8}{5}\\ =\dfrac{8}{5}\cdot\left(\dfrac{39}{16}-\dfrac{7}{16}\right)=\dfrac{8}{5}\cdot2=\dfrac{16}{5}\\ b,\\ \dfrac{4}{3}\cdot\dfrac{9}{8}-\dfrac{4}{3}\cdot\dfrac{3}{8}=\dfrac{3}{2}-\dfrac{1}{2}=1\)

a)

`39/16:5/8-7/16:5/8`

`=(39/16-7/16):5/8`

`=32/16xx8/5`

`=2xx8/5`

`=16/5`

b)

`4/3xx9/8-4/3xx3/8`

`=4/3xx(9/8-3/8)`

`=4/3xx6/8`

`=4/3xx3/4`

`=1`

a) \(\dfrac{3}{5}\times\dfrac{17}{21}+\dfrac{17}{21}\times\dfrac{2}{5}\)

\(=\dfrac{17}{21}\times\left(\dfrac{3}{5}+\dfrac{2}{5}\right)\)

\(=\dfrac{17}{21}\times1\)

\(=\dfrac{17}{21}\)

b) \(\dfrac{15}{8}:\dfrac{5}{20}-\dfrac{7}{8}:\dfrac{1}{4}\)

\(=\dfrac{15}{8}\times\dfrac{20}{5}-\dfrac{7}{8}\times4\)

\(=\dfrac{15}{8}\times4-\dfrac{7}{8}\times4\)

\(=4\times\left(\dfrac{15}{8}-\dfrac{7}{8}\right)\)

\(=4\times1\)

\(=4\)

a, =(3/5+2/5)x17/21

=1x17/21

=17/21

a) \(\dfrac{3}{5}\) x \(\dfrac{17}{21}+\dfrac{17}{21}\) x \(\dfrac{2}{5}\)

\(=\left(\dfrac{3}{5}+\dfrac{2}{5}\right)\) x \(\dfrac{17}{21}\)

\(=\dfrac{5}{5}\) x \(\dfrac{17}{21}\)

\(=1\) x \(\dfrac{17}{21}\)

\(=\dfrac{17}{21}\)

b) \(\dfrac{15}{8}:\dfrac{5}{20}-\dfrac{7}{8}:\dfrac{1}{4}\)

\(=\dfrac{15}{8}:\dfrac{1}{4}-\dfrac{7}{8}:\dfrac{1}{4}\)

\(=\left(\dfrac{15}{8}-\dfrac{7}{8}\right):\dfrac{1}{4}\)

\(=\dfrac{8}{8}:\dfrac{1}{4}\)

\(=1:\dfrac{1}{4}\)

\(=\dfrac{1}{1}:\dfrac{1}{4}\)

\(=\dfrac{1}{1}\) x \(\dfrac{4}{1}\)

\(=\dfrac{4}{1}\)

\(=4\)