Question

TÍNH BẰNG 2 CÁCH 

15 15/100 + 20 95/100

9 3/4 - 8 1/2

Answer 1

a) Cách 1 : 

 \(15\frac{15}{100}+20\frac{95}{100}\)

= \(\frac{1515}{100}+\frac{2095}{100}\)

= \(\frac{361}{10}\)= 36,1

Cách 2 :

\(15\frac{15}{100}+20\frac{95}{100}\)

= 15,15 + 20,35

= 36,1

b) Cách 1 : 

\(9\frac{3}{4}-8\frac{1}{2}\)

= \(\frac{39}{4}-\frac{17}{2}\)

= \(\frac{5}{4}\) = 1,25

Cách 2 :

\(9\frac{3}{4}-8\frac{1}{2}\)

= 9,75 - 8,5

= 1,25

Answer 2

\(15\frac{15}{100}+20\frac{95}{100}=\left(15+20\right)+\frac{15+95}{100}=30+1\frac{5}{100}=31,05\)

\(9\frac{3}{4}-8\frac{1}{2}=\left(9-8\right)+\left(\frac{3}{4}-\frac{1}{2}\right)=1+\left(\frac{3}{4}-\frac{2}{4}\right)=1+\frac{1}{4}=1,25\)