0,5 \(\times\) 12: 0,5 - (5,1 - 10,2 \(\times\) 0,5) : 0,125

= (0,5 : 0,5) \(\times\) 12 - (5,1 - 5,1):0,125

= 1 \(\times\) 12 - 0 : 0,125

= 12

x * 0,125 + x * 0,5 = 10,35

x * 8 + x * 2 = 10,35

x * ( 8+  2 ) = 10,35

x * 10 = 10,35

x = 10,35 : 10

x = 1,035

1,035 là đúng rồi

c, 28,35: 0,125 + 42,65: 0,125 + 1:0,125

= (28,35 + 42,65 + 1) : 0,125

= 72 : 0,125

= 72 x 8

= 576

a, 1,25 x 10,8 x 0,8:0,9

= (1,25 x 0,8) x (10,8 :0,9)

= 1 x 12

= 12

ko bt

câu 1 và 2 k tính thuận tiện đc nhé bạn 

câu 3 : = ( 28,35 + 42,65 + 1 ) : 0,125 = 72 : 0,125 = 9 

7 - 1 = 0 <3 <3 

1,25x10,8x0,8:0,9

=(1,25x0,8)x10,8:0,9

=1x10,8:0,9

=10,8:0,9

=12

0,64 x 0,04 x 25 : 0,8 + 0,5 x 0,112

=0,64x1:0,8+0,056

=0'64:0,8+0,056

=0,8+0,056

=0,856

28,35 : 0,125 + 42,65 :0,125 + 1 : 0,125

=28,35x8+42,65x8+1x8

=8x(28,35+42,65+1)

=8x72

=576

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

= 4,2 nha bạn

a) 152,5

b) 125,75

8. (-1,6) x (-0,125) x (-0,5)

= 8 . [(-1,6) x (-0,125) x (-0,5)]
= 8 . (-0,1)

= -0,8

a) \(2\times4\times8\times0,5\times0,125\times0,25\times\left(0,4321+0,5679\right)\)
\(\Rightarrow\left(2\times0,5\right)\times\left(4\times0,25\right)\times\left(8\times0,125\right)\times1\)
\(\Rightarrow1\times1\times1\times1\)
\(\Rightarrow1\)