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2009-06-01T22:35:41+02:00
A)2 i 1/3 + 5 i 1/2 =2 2/6+5 3/6=7 5/6
b)7 i 1/4 - 3 i 3/5 =7 5/20- 3 12/20=6 25/20 - 3 12/20= 3 13/20
c)1 i 1/4 * 3 i 2/9 =5/4*29/9=145/36=4 1/36
d) 2 i 1/4 : 2 i 2/5 =9/4: 12/5= 9/4*5/12=15/16

a) oblicz liczbe, ktorej 35% stanowi 252
100% - x
35% - 252

x= (100%*252):35%
x=720

b)oblicz 30% z liczby 270
30%*270=0,3*270=81

c)oblicz, ile procent liczby 80 stanowi liczba 20.
100%-80
x - 20

x=(100%*20):80=25%
2009-06-01T22:38:42+02:00
1.
a)2 i 1/3 + 5 i 1/2 = 7/3 + 11/2 = 14/6 + 33/ 6 = 47/6 = 7 i 5/6
b)7 i 1/4 - 3 i 3/5 = 6 i 5/4 - 3 i 3/5= 6 25/4 - 3 12/20 = 3 13/20
c)1 i 1/4 * 3 i 2/9 = 5/4 * 29/9 = 145/36 = 4 1/36
d) 2 i 1/4 : 2 i 2/5 =9/4 : 12/5 = 9/4 * 5/12 = 45/48

.
a) oblicz liczbe, ktorej 35% stanowi 252
35 - 252
100 - x
x = 720
b)oblicz 30% z liczby 270
270 -100%
X -- 30%
x = 30*270 / 100 = 81
c)oblicz, ile procent liczby 80 stanowi liczba 20
80 - 100%
20 - x%
x = 20*100 / 80 = 25%
2009-06-01T22:54:37+02:00
1.
a) 2i1/3+5i1/2=7i5/6
b) 7i1/4-3i3/5=3,65
c) 1i1/4*3i2/9=4,02
d) 2i1/4:2i2/5=45/48
2.
a)
35 - 252
100 - x
x = 720
b) 30%*270=0,3*270=81
c) 20*4=80:4=1/4 tj.25%