16,8 x 0,125 : 0,5

= 16,8 x 0, 125 x 2

= 16,8 x 0,25

= 4,2.

k mình nha ^^.

làm ơn đi

a) 21,6 x 12,5 x 8

= 21,6 x ( 12,5 x 8 )

= 21,6 x 100

= 2160

b) 16,8 x 0,125 : 0,5

= 16,8 x 0,125 x 2

= 16,8 x ( 0,125 x 2 )

= 16,8 x 0,25

= 4,2

a) 21,6 x 12,5 x 8                ;               b) 16,8 x 0,125 : 0,5

= 21,6 x ( 12,5 x 8 )                             = 16,8 x ( 0,125 : 0,5 )

= 21,6 x 100                                        = 16,8 x 0,25

= 2160                                                = 4,2

Xong rùi đó. k cho mình nha!

19,8: 0,25 x 7,2 : 0,125 x 8,4 : 0,5= 76640,256

6,6 x 8 x 2,4 x 4 x 16,8 : 0,2 = 42577,92

em cứ việc thực hiện từ trái qua phải là được !!!
hoặc có thể sử dụng máy tính 

= 76640.256

=1703.1168

\(19,8:0,25.7,2:0,125.8,4:0,5\)

\(=19,8.4.7,2.8.8,4.2\)

\(=79,2.57,6.16,8\)

\(=76640,256\)

\(6,6.8.2,4.4.16,8:0,2\)

\(=52,8.9,6.84\)

\(=42577,92\)

a) $19,8:0,25.7,2:0,125.8,4:0,5$

$=19,8:\dfrac{1}{4}.7,2:\dfrac{1}{8}.8,4:\dfrac{1}{2}$

$=19,8.4.7,2.8.8,4.2=76640,256$

b) $6,6.8.2,4.4.16,8:0,2$

$=6,6.8.2,4.4.16,8:\dfrac{1}{5}$

$=6,6.8.2,4.4.16,8.5=42577,92$

a) 152,5

b) 125,75

= 13,25 x 2 + 13,25 x 4 + 13,25 x 8 + 13,25 x 6

= 13,25 x ( 2+4+8+6)

= 13,25 X 20

=265

= 13,25 x 2 + 13,25 x 4 + 13,25 x 8 + 13,25 x 6

= 13,25 x ( 2+4+8+6)

= 13,25 X 20

=265

6: \(9,5\times4,7+9,5\times4,3+9,5\)

\(=9,5\times\left(4,7+4,3+1\right)\)

\(=9,5\times10=95\)

5: \(32\times1,25\times2,5+0,476+0,524\)

\(=80\times1,25+1\)

=100+1

=101

4: \(3,5\times0,5+3,5\times0,125+3,5\times22,5\times4\)

=3,5x(90+0,5+0,125)

=3,5x90,625

=317,1875

3: \(32\times1,25\times2,5+\frac{54}{10}\times8,7+5,4\times3,3-10,8\)

\(=40\times2,5+5,4\times8,7+5,4\times3,3-5,4\times2\)

=100+5,4x(8,7+3,3-2)

=100+5,4x10

=100+54

=154

2: \(15,25\times0,5+15,25\times0,25+15,25\times0,125+15,25\times6\)

=15,25x(0,5+0,25+0,125+6)

=15,25x6,875

=104,84375

1: 2020x0,56+0,34x6060+8080x0,85+2020x5,02

=2020x0,56+2020x1,02+2020x3,4+2020x5,02

=2020x(0,56+1,02+3,4+5,02)

=2020x10

=20200

122.5

...

122,5

a)(-2,5 x 0,38 x 0,4) - [0,125 x 3,15 x (-8)]

=[(-2,5 x 0,4) x 0,38] - [(-8 x 0,125) x 3,15]

=(-1 x 0,38) - (-1 x 3,15)

=(-0,38) - (-3,15)

=2,77

a) 2,77

b)-2