Question

zad1 oblicz pamietajac o kolejnosci wykonywania dzialan

a)1/2+1,5

b)3,2 - 1 i 1/3

c)2,4 * 3/8

d) 2 i 4/3 : 2,75

e) 12 i 1/2 : 1/5 * 2,5

f) 3 i 3/4 + 0,28 * 1 i 11/14

g) 5,7 : (5 i 3/7 - 3,8)

h) 4,08 - 2,08 : 13/25

i) (0,2 +1/2)do potegi 2

Answer 1

a) 2

b) 3 i 1/5 - 1 i 1/3 = 16/5 - 4/3 = 48/15 - 20/15 = 28/15 = 1 i 13/15

c) 2 i 2/5 * 3/8 = 12/5 * 3/8 = 16/40 = 2,5

d) 10/3 : 2 i 3/4 = 10/3 * 4/11 = 12/110 = 6/55

e) 12,5 : 0,2 * 2,5 = 62,5 * 2,5 = 156,25

f) 3,75 + 0,28 * 25/14 = 3,75 + 28/100 * 25/14 = 3, 75 + 700/1400 = 3 i 3/4 + 2/4 = 4,75

g) 5 i 7/10 : (38/7 - 38/10) = 5 i 7/10 : (380/70 - 266/70) = 5 i 7/10 : 114/70 = 57/10 * 70/114 = 3990/1140 = 3,5

h) 4,08 - 2 i 8/100 : 13/25 = 4,08 - 208/100 * 100/52 = 4,08 - 208/52 = 4,08 - 4 = 0,08

i) 0,04 + 0,25 = 0,29

Answer 2

a) 1/2+1/2= 2/4+2/4= 4/4 = 1

b) 3,2-1+1/3= 2,2 + 1/3 =  2  2/10 + 1  1/3= 2 6/30+ 1 10/30 =3 16/30 = 3 6/10 =3 3/5

c ) 2/4*3/8 = 3/16= 1/3

d) 2+ 4/3 : 2,75 = 2  4/3 : 2 75/100 = 10/3  : 275/100= 10/3 * 100/275= 1000/825 = 175/825

e) 12 1/2 : 1/5 * 2/5 = 25/2 *5/1 * 2/5 = 125/2 * 2/5 =25

f) 3 3/4 + +0,28*1 11/14= 3 3/4 + 28/100*25/14= 3 3/4+14/28= 3 21/28+14/28= 3 35/28= 4 7/28= 4 1/4

g ) 5,7 : (5 i 3/7 - 3,8) = 5,7 : ( 5  3/7 - 3  8/10) = 5,7 : ( 5 30/70 - 3  56/70)= 5,7 :

( 5 100/70 - 3 56/70) = 5,7 : 2 44/70 = 5  7/10: 2 44/70= 57/10*70/184= 339/184 ( trzeba to jeszcze skrócić

h )4,08 - 2,08 : 13/25= 4,08 - 2 8/100: 13/25= 4,08 - 208/100 *25/100 = 4,08 - 4=0,08

i ) (0,2 +1/2)do potegi 2 = 0,2 + 0,25=0,45