\(2,04:-3,12=\frac{204}{100}:\frac{-312}{100}=\frac{204}{100}.\frac{100}{-312}=\frac{204}{-312}=\frac{-17}{26}\)    

giải:

a. \(2,04:\left(-3,12\right)=\frac{204}{100}:\frac{-312}{100}=\frac{204}{100}.\frac{100}{-312}=\frac{204}{-312}=\frac{-17}{26}\)

b,\(\left(-1\frac{1}{2}\right):1,25=\frac{-3}{2}:\frac{125}{100}=\frac{-3}{2}.\frac{100}{125}=\frac{-6}{5}\) 

c,\(4:5\frac{3}{4}=\frac{4}{1}:\frac{23}{4}=\frac{4}{1}.\frac{4}{23}=\frac{16}{23}\)                                                                                                                          d,\(10\frac{3}{7}:5\frac{3}{14}=\frac{73}{7}:\frac{73}{14}=\frac{73}{7}.\frac{14}{73}=\frac{2}{1}\)

a) \(2.04:\left(-3.12\right)=\dfrac{204}{-312}=\dfrac{-17}{26}\)

b) \(\left(-1\dfrac{1}{2}\right):1.25=\dfrac{-3}{2}:\dfrac{5}{4}=\dfrac{-3}{2}\cdot\dfrac{4}{5}=\dfrac{-12}{10}=\dfrac{-6}{5}\)

c) \(4:5\dfrac{3}{4}=4:\dfrac{23}{4}=4\cdot\dfrac{4}{23}=\dfrac{16}{23}\)

d) \(10\dfrac{3}{7}:5\dfrac{3}{14}=\dfrac{73}{7}:\dfrac{73}{14}=\dfrac{2}{1}\)

a, 2,04 : (-3,12) = (-2,04) : 3,12 = -204/312 = -17/26

Ta có tỉ lệ thức: 2,04 : (-3,12) = -17 : 26

b, (-3/2) : 1,25 = (-3/2) : 5/4 = (-3/2) . 4/5 = -12/10 = -6/5

Ta có tỉ lệ thức: (-3/2) : 1,25 = -6 : 5

c, 4 : 23/4 = 4 . 4/23 = 16/23

Ta có tỉ lệ thức: 4 : 23/4 = 16 : 23

d, 73/3 : 73/14 = 73/3 . 14/73 = 3/14

Ta có tỉ lệ thức: 73/3 : 73/14 = 3 : 14

a) 2,04:(-3,12)              c)4:5 3/4

   =-17/23                      = 3/5

b) (-11/2):1,25              d)10 3/7:5 3/14

   =-22/5                         =9/49

Thay tỉ số [-1 1/2].. 1,25 bằng tỉ số nguyên ta được

A /5/6 B /-6/5 C/6/5 D /-5/6

a. 2,04 : (-3,12)

= 204/100 : (-312/100)

= 51/25 : (-78/25)

= 51/25 . (-25/78)

= -51/78

= -17/26

b. \(\left(-1\frac{1}{2}\right):1,25=\left(-\frac{3}{2}\right):\frac{125}{100}=\left(-\frac{3}{2}\right):\frac{5}{4}=\left(-\frac{3}{2}\right).\frac{4}{5}=-\frac{6}{5}\)

c. \(4:5\frac{3}{4}=4:\frac{23}{4}=4.\frac{4}{23}=\frac{16}{23}\)

d. \(10\frac{3}{7}:5\frac{3}{14}=\frac{73}{7}:\frac{73}{14}=\frac{73}{7}.\frac{14}{73}=\frac{14}{7}=\frac{2}{1}\)

a)  

b)  

c) 

d)