Question

Oblicz :

20,5 : 3/5 - 0,4 * 3/4 =

3,5 * 1 1/4 - 2 5/8 =

(3,6- 1 1/4 ) * 1,4 =

Answer 1

20,5 : 3/5 - 0,4 * 3/4 =

 

= 20 i 5/10 : 3/5 - 4/10 * 3/4=

 

= 20 i 1/2 * 5/3 - 1/10 * 3/1=

 

= 41/2 * 5/3 - 3/10 =

 

= 205/6 - 3/10=

 

= 34 i 1/6 - 3/10=

 

= 34 i 5/30 - 9/30 =

 

= 33 i 26/30

 

 

 

 

 

3,5 * 1 i 1/4 - 2 i  5/8 =

 

= 3 i 5/10 * 5/4 - 2 i 5/8=

 

= 3 i 1/2 * 5/4 - 2 i 5/8 =

 

= 7/2 * 5/4 - 2 i 5/8=

 

= 35/8 - 2 i 5/8 =

 

= 4 i 3/8 - 2 i 5/8=

 

= 1 i 6/8=

 

= 1 i 3/4

 

lub

 

3,5 * 1 i 1/4 - 2 i  5/8 =

 

= 3,5 * 1 i 25/100 - 2 i 625/1000=

 

= 3,5 * 1,25 -2,625=

 

= 4,375 - 2,625 =

 

= 1,75

 

 

 

 

 

 

(3,6- 1 i 1/4 ) * 1,4 =

 

= (3 i 6/10 - 1 i 1/4) * 1 i 4/10=

 

= (3 i 12/20 - 1 i 5/20) * 14/10=

 

= 2 i 7/20 * 14/10=

 

= 47/20 * 14/10=

 

= 47/10 * 7/10=

 

= 329/100=

 

= 3 i 29/100

 

 

lub

 

(3,6- 1 i 1/4 ) * 1,4 =

 

= (3,6 - 1 i 25/100) * 1,4=

 

= (3,6 - 1,25) * 1,4 =

 

= 2,35 *1,4=

 

= 3,29