Question

Câu 13. (0,5 điểm): Tính giá trị $\left(2+\dfrac{1}{3}-0,4\right)-\left(7-\dfrac{3}{5}-\dfrac{4}{3}\right)-\left(\dfrac{1}{5}+\dfrac{5}{3}-4\right)$.

Answer 1

   ( 2 + \(\dfrac{1}{3}\) - 0,4 ) - ( 7 - \(\dfrac{3}{5}\) - \(\dfrac{4}{3}\)) - ( \(\dfrac{1}{5}\) + \(\dfrac{5}{3}\)- 4)

=  2 + \(\dfrac{1}{3}\)- \(\dfrac{2}{5}\) - 7 + \(\dfrac{3}{5}\) + \(\dfrac{4}{3}\) - \(\dfrac{1}{5}\)  - \(\dfrac{5}{3}\) + 4

= ( 2 - 7 + 4) + ( \(\dfrac{1}{3}\) + \(\dfrac{4}{3}\)- \(\dfrac{5}{3}\)) + ( -\(\dfrac{2}{5}\) + \(\dfrac{3}{5}\) - \(\dfrac{1}{5}\))

= -1 + 0 + 0

= - 1  

Answer 2

=(2+0,3-0,4)-(7-0,6-1,3)-(0,2+1,6)

=(2,3-0,4)-(7,6-1,3)-1,8

=1,9-6,3-1,8

= -2,6

 

Answer 3

=(2+0,3-0,4)-(7-0,6-1,3)-(0,2+1,6)

=(2,3-0,4)-(7,6-1,3)-1,8

=1,9-6,3-1,8

= -2,6

 

Answer 4

(2-7+4-0,4)+(3/5-1/5)+(1/3+4/3-5/3)

(-1-0,4)+2/5+0

-1-0,4+0,4

-1

Answer 5

a)-19/3

Answer 6

-1

Answer 7

-1

Answer 8

(2

Answer 9

(2

Answer 10

 

Answer 11

  

Answer 12

 

Answer 13

=(2+1/3-1/5)-(7-3/5-4/3)-(1/5+5/3-4)

=(120/60+20/60-12/60)-(420/60-36/60-80/60)-(12,60+100/60-240/60)

=120+20-12/60-420-36-80/60-12+100-240/60

=128/60-394/60-(-128)/60

=128-394+128/60

=-138/60

=-2,3

Answer 14

=2+ 1/3 - 0,4 - 7+ 3/5 + 4/3 - 1/5 - 5/3 + 4

= (2 - 0,4 - 7 + 4) + (1/3 + 4/3 - 5/3) +(3/5 -1/5)

=         (-1,4)         +        0                 +    0,4

=                     (-1)

Answer 15

(2+31​−0,4)−(7−53​−34​)−(51​+35​−4)

=(2−7+4−0,4)+(35−15)+(13+43−53)=(2−7+4−0,4)+(53​−51​)+(31​+34​−35​)

=(−1−0,4)+25+0=(−1−0,4)+52​+0

$=-1-0,4+0,4=-1$.

Answer 16

Guiu

Answer 17

29/15-76/15--32/15

-10/3--32/15

-6/5

Answer 18

\(\left(2+\dfrac{1}{3}-0,4\right)-\left(7-\dfrac{3}{5}-\dfrac{4}{3}\right)-\left(\dfrac{1}{5}+\dfrac{5}{3}-4\right)\)

= \(\dfrac{29}{15}-\dfrac{76}{15}-\dfrac{-32}{15}\)

= -1

Answer 19

7/15

Answer 20

-1

Answer 21

-1

Answer 22

(2 - 7 + 4 - 0,4) + (3/5 - 1/5) + (1/3 + 4/3 - 5/3)

= -1 + (-0,4) + 2/5 + 0 

= -1,4 + 0.4 + 0

= -1