Question

1-calcule

A)4/5×3/6

B)2/6÷4/5

C)6/8×4/6÷2/5

D)12/6÷3/5×5/6

E)5,12÷0,02

F)0,125÷0,08

G)1,25÷0,025

H)1,731÷0,03

Answer 1

A)4/5×3/6 = $\frac{12}{30}= \frac{2}{5}$

B)2/6÷4/5 =$\frac{2}{6} . \frac{5}{4} = \frac{10}{24}= \frac{5}{12}$

C)6/8×4/6÷2/5= $\frac{6}{8}. \frac{4}{6}. \frac{5}{2}= \frac{6.4.5}{8.6.2}= \frac{4.5}{8.2}= \frac{2.5}{8}= \frac{10}{8} = \frac{5}{4}$

D)12/6÷3/5×5/6=$2. \frac{5}{3}. \frac{5}{6}= \frac{50}{18}= \frac{25}{9}$

E)5,12÷0,02 =$\frac{512}{100}: \frac{2}{100}= \frac{128}{25}: \frac{1}{50}= \frac{128}{25}. \frac{50}{1}= \frac{128}{25}. \frac{2.25}{1}=128 .2 = 256$

F)0,125÷0,08= $\frac{125}{1000} : \frac{8}{100}= \frac{5}{40} : \frac{2}{25}= \frac{1}{8}: \frac{2}{25}= \frac{1}{8}. \frac{25}{2}= \frac{25}{16}$

G)1,25÷0,025= $\frac{125}{100} : \frac{25}{1000}= \frac{5}{4} : \frac{1}{40}= \frac{5}{4} . \frac{40}{1}= 5.10 = 50$

H)1,731÷0,03 =$\frac{1731}{1000} :\frac{3}{100}= \frac{1731}{1000}. \frac{100}{3}= \frac{1731}{10}. \frac{1}{3}= \frac{1731}{30}= 57,7$