bạn lên gole

= ( 2,78 + 3,22 ) - ( 9,34 + 5,66)

= 6 - 15

= - 9

Mizuki Kanzaki

\(2,78-9,34+3,22-5,66\)

\(=\left(2,78+3,22\right)-\left(9,34+5,66\right)\)

\(=6-15\)

\(=-9\)

a, ( 10 + 10 ) - ( 9,34 + 9 , 66 ) 

    = 20 - 19 

    = 1

b, 12 - 2 , 64

   = 9,36

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

   = (10 + 10) - (9,66-9,34 )

   =     20       -       0,32             =    19 , 68

b. = 12 -     2,64   =      9,36

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

\(\dfrac{7}{10}\left(4+3-7\right)=\dfrac{7}{10}\times0=0\)

\(\dfrac{7}{10}\left(4+3-7\right)=\dfrac{7}{10}\times0=0\)

= 7/10 x(4 + 3 - 7)

= 0

` 3xx 7/10 + 7/10 xx 5 +2 xx 7/10`

`=7/10 xx (3+5+2)`

`= 7/10 xx 10`

`=7`

\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}=\dfrac{7}{10}\times\left(3+5+2\right)=\dfrac{7}{10}\times10=7\)

7

4x7/10+7/10x5+7/10

= 7/10 x ( 4+5+1)

= 7/10 x 10

= 7

`4xx7/10+7/10xx5+7/10xx1`

`=>(4+5+1)xx7/10`

`=>10xx7/10`

`=>70/10=7`

4 x 7/10 + 7/10x5 + 7/10

=4 x 7/10 + 7/10x5 + 7/10x1

= 7/10 x ( 4+5+1)

= 7/10 x 10

= 7

Đề:

`B = (1991 xx 1992xx1993xx1994xx995)/(1990xx1991xx1992xx1993xx997)`

`B = (1xx1xx1xx2xx995)/(1990xx1xx1xx1xx1)`

`B = (2xx995)/1990`

`B = 1990/1990 `

`B = 1`

TL:

800.000 : 10 + 200.000

= (800.000 + 200.000) : 10

= 1.000.000 : 10

= 100.000

HT

\(=\left(\dfrac{3}{7}+\dfrac{8}{14}\right)+\left(\dfrac{3}{10}+\dfrac{7}{10}\right)=1+1=2\)

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