Giúp mik với ạ mik cảm ơn ^^

Đáp án:

Giải thích các bước giải:

a) `(-1)/-3-1/3-(-1)/-2-3/4`

`=1/3-1/3-1/2-3/4`

`=0-1/2-3/4`

`=(-1)/2-3/4`

`=(-5)/4`

b) `(-2)/-5-3/10-(-1)/2-(-2)/5`

`=2/5-3/10+1/2+2/5`

`=4/10-3/10+5/10+4/10`

`=1`

c) `(-1)/3*3/5+(-1)/3*2/5+1 1/3`

`=(-1)/3.(3/5+2/5)+1 1/3`

`=(-1)/3*1+1 1/3`

`=(-1)/3+4/3`

`=1`

d) `(-2)/5*3/4-2/5*1/4-2 1/5`

`=(-2)/5*3/4+(-2)/5*1/4-2 1/5`

`=(-2)/5*(3/4+1/4)-2 1/5`

`=(-2)/5*1-2 1/5`

`=(-2)/5-11/5`

`=(-13)/5`

e) `1 3/4*0,5-12/20:(-8)/5`

`=7/4*1/2-3/5*(-5)/8`

`=7/8-(-3)/8`

`=5/4`

f) $-1\dfrac{2}{5}\cdot0,375-\dfrac{8}{10}:\dfrac{-4}{5}$

`=(-7)/5*3/8-4/5:(-4)/5`

`=(-21)/40+1`

`=(19)/40`