a) =9,46
b) =45
c) =20,32
d) =34,9
 

Bài 2. Tính nhanh :
a) 12 – ( 12 – 9,36 )

= 12 - 2,64

= 9,36

b) 72,64 – 18,35 – 9,29

= 54,29 - 9,29

= 45

c) ( 10 – 9,34 ) + ( 10 + 9,66 )

= 0.66 + 19,66

= 20,32

d) 45,83 – 8,46 – 6, 54 + 4,17

= 37,37 - 10,71

= 26,66

( 10 - 9,34) + (10 - 9,66) = 0,66 +0,34 =1

12 - (12 - 9,36)= 12 -2,64 = 9,36

**** cho mink nhé

1.

( 10 - 9,34 ) + ( 10 - 9,66 )

= 0,66 + 0,34

= 1

12 - ( 12 - 9,36 ) 

= 12 - 2,64

= 9,36

38,52 + 0,302 x 100 - 0,72

= 38,52 + 30,2 - 0,72

= 68,72 - 0,72

= 68

2.

\(1-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):16\frac{2}{3}=0\)

\(1-\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=0\)

\(\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=0+1=1\)

\(\left(x-\frac{151}{12}\right):\frac{50}{3}=1\)

\(x-\frac{151}{12}=1\times\frac{50}{3}\)

\(x-\frac{151}{12}=\frac{50}{3}\)

\(x=\frac{50}{3}+\frac{151}{12}\)

\(x=\frac{117}{4}\)

Bài 1

\(\left(10-9,34\right)+\left(10-9,66\right)\)

\(=0.66+0,34=1\)

\(12-\left(12-9,36\right)\)

\(=12-2.64=9,36\)

\(38,52+0,302.100-0,72\)

\(=38,52+30,2-0,72\)

\(=7.6\)

Bài 2

\(1-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):16\frac{2}{3}=0\)

\(1-\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=0\)

\(\left(\frac{43}{8}+x-\frac{173}{24}\right):\frac{50}{3}=1\)

\(\frac{43}{8}+x-\frac{173}{24}=\frac{3}{50}\)

\(\frac{43}{8}+x=\frac{3}{50}+\frac{173}{24}\)

\(\frac{43}{8}+x=\frac{4361}{600}\)

\(x=\frac{142}{75}\)( gửi lại bài 2 đã ) 

Bài 2 :

\(1-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):16\frac{2}{3}=0\)

\(\left(\frac{15}{8}+x-\frac{35}{24}\right):\frac{32}{3}=1\)

\(\frac{5}{8}+x-\frac{35}{24}=\frac{32}{3}\)

\(\frac{5}{8}+x=\frac{97}{8}\)

\(x=\frac{92}{8}=\frac{23}{2}\)

12- ( 12 - 9,36 ) 

= 9,36 - ( 12 - 12 )

= 9,36 - 0

= 9,36

=12-12+9,36

=0+9,36

=9,36

(10-9,34)+(10-9,66)

=10-9,34+10-9,66

=(10+10)+(-9,34-9,66)

=20-19

=1

= (10+10)+(9,34+9,66)=1 

chúc bạn học tốt nha 

nếu chx hc dấu âm thì:

(10-9,34)+(10-9,66)

=10-9,34+10-9,66

=(10+10)-(9,34+9,66)

=20-19

=1

Tính:

a, 9-9x9+9-9

= 9 - 81 + 9 - 9 

= - 72 + 0 

= -72

b, 10-10x10x10

=   10 - 10 x 100

= 10 - 1000

= -990

c, 11+11:11+11

= 11 + 1 + 11

= 12 + 11 

= 23 

d, 12x12:12:12

=  144 : 1 

= 144 

12 - (12- 9,36)

= 12- 2,64

= 9,36

tk nhé

12 - ( 12 - 9 , 36 )

= 12 - 12 + 9 , 36

= 0 + 9 , 36

=  9 , 36

minh lam nhu at the speed of light