Question

Thực hiện phép tính :
A) 0,6 +2/-3                                                       B) 1/3-(-0,4)
C) 3,5 x (-1và2/5)                                             D) -5/23:(-2)

Answer 1

a: =3/5-2/3=9/15-10/15=-1/15

b: =1/3+2/5=5/15+6/15=11/15

c: =3/5x(-7/5)=-21/25

d: =-5/23:(-2)=5/46

Answer 2

`0,6 + 2/(-3) = 0,6 -2/3 = 3/5-2/3 = 9/15 - 10/15 = -1/15`

`1/3 - (-0,4)=1/3 + 0,4 = 1/3 + 3/5 = 5/15 + 9/15 = 11/15`

`3/5 xx (-1) 2/5 = 3/5 xx (-7)/5 = -21/25`

`-5/23 : (-2)=-5/23 xx (-1)/2 = 5/23 xx 1/2 = 5/46`

Answer 3

\(a.0,6+-\dfrac{2}{3}=\dfrac{3}{5}-\dfrac{2}{3}=-\dfrac{1}{15}\)

\(b.\dfrac{1}{3}-\left(-0,4\right)=\dfrac{1}{3}+\dfrac{2}{5}=\dfrac{11}{5}\)

\(c.3,5.\left(-1\dfrac{2}{5}\right)=\dfrac{7}{2}.\left(-\dfrac{7}{5}\right)=-\dfrac{49}{10}\)

\(d.-\dfrac{5}{23}:\left(-2\right)=-\dfrac{5}{23}.\left(-\dfrac{1}{2}\right)=\dfrac{5}{46}\)

Answer 4

\(a)0,6+\dfrac{2}{-3}\)

\(\dfrac{3}{5}+\dfrac{-2}{3}=\dfrac{9}{15}+\dfrac{-10}{15}=\dfrac{9+\left(-10\right)}{15}=\dfrac{-1}{15}\)

____________________

\(b)\dfrac{1}{3}-\left(-0,4\right)\)

\(\dfrac{1}{3}-\left(-\dfrac{2}{5}\right)=\dfrac{5}{15}-\dfrac{-6}{15}=\dfrac{5-\left(-6\right)}{15}=\dfrac{11}{15}\)

_________________________

\(c)3,5.\left(-1\dfrac{2}{5}\right)\)

\(\dfrac{7}{2}.\left(-\dfrac{7}{5}\right)=-\dfrac{49}{10}\)

___________________________

\(d)-\dfrac{5}{23}:\left(-2\right)=-\dfrac{5}{23}.\left(-\dfrac{1}{2}\right)=\dfrac{5}{46}\)