Question

Answer 1

`-6,07 + 3,58 = -2,49`

`3/5+(-4)=3/5 - 4=3/5 - 20/5 = -17/5`

`1 3/5 -(-7)/11 = 1 3/5+7/11 = 8/5 + 7/11 = 88/55 + 35/55  = 123/55`

`(-7)/13 + 0,6 = -7/13 +3/5 = 4/65`

`(-17)/7 :0,25 = -17/5 : 1/4 = -17/7 . 4 = -68/7`

`-1,221 . 2/(-5) = 1,221 . 2/5 = 1221/2500`

Answer 2

cau 1 thui a

 

Answer 3

Câu 1: 

a: =-2,49

b: =3/5-20/5=-17/5

c: \(=\dfrac{7}{5}+\dfrac{7}{11}=\dfrac{77+35}{55}=\dfrac{112}{55}\)

d: \(=\dfrac{-7}{13}+\dfrac{3}{5}=\dfrac{-35+39}{65}=\dfrac{4}{65}\)

f: \(=-\dfrac{17}{7}\cdot4=-\dfrac{68}{7}\)

e: \(=1.221\cdot\dfrac{2}{5}=0.4884\)

Answer 4

Bài `1`

`a)-6,07 + 3,58=-2,49`

`b) 3/5 + (-4)=3/5 + (-20/5)= -17/5`

`c) 1 3/5 - (-7/11)= 8/5 + 7/11= 123/55`

`d) -7/13 + 0,6 = -7/13 + 6/10= 4/65`

`f) -17/7 : 0,25 = -17/7 : 25/100= -17/7 . 100/25=-68/7`

`e)-1,221 .(-2/5) = 0,4884`

Answer 5

Bài 1
a) đề bài 
=-2,49
b) Đề bài 
= \(\dfrac{3}{5}-4\)
= -\(\dfrac{17}{5}\)
c) Đề bài 
= \(\dfrac{1x5+3}{5}-\dfrac{-7}{11}\)
=\(\dfrac{5+3}{5}-\dfrac{-7}{11}\)
=\(\dfrac{8}{5}-\dfrac{-7}{11}\)
=\(\dfrac{8}{5}-\left(-\dfrac{7}{11}\right)\)
=\(\dfrac{8}{5}+\dfrac{7}{11}\)
=\(\dfrac{8x11}{5x11}+\dfrac{7x5}{11x5}\)
= \(\dfrac{88+35}{55}\)
=\(\dfrac{123}{55}\)

Answer 6