Odpowiedzi

2010-02-17T12:51:11+01:00
Znajdź liczbę której
a) 2/7 stanowi 1 3/5
x*2/7=1 3/5
2/7x=8/5
x=8/5*7/2
x=28/5
x=5 i 3/5

b)3/4 stanowi 3 1/2
x*3/4= 3 1/2
3/4x=7/2
x=7/2*4/3
x=14/3
x=4 i 2/3

c)1 1/3 stanowi 6
1 1/3x=6
4/3x=6
x=6*3/4
x=9/2
x=4 i 1/2

d) 2 2/5 stanowi 6 3/4
2 2/5x=6 3/4
12/5x=27/4
x=27/4*5/12
x=135/48
x=2 39/48
2010-02-17T12:52:24+01:00
A) 2/7 stanowi 1 3/5
2/7*x= 1 3/5 /:2/7
x = 1 3/5 : 2/7 = 8/5 * 7/2 = 28/5 = 5 3/5
b)3/4 stanowi 3 1/2
3/4*x= 3 1/2 /:3/4
x = 3 1/2 : 3/4 =7/2 * 4/3 = 14/3 = 4 2/3
c)1 1/3 stanowi 6
1 1/3*x= 6 /:1 1/3
x = 6 : 1 1/3 = 6 : 4/3 = 6 * 3/4 = 9/2 = 4 1/2
d) 2 2/5 stanowi 6 3/4
2 2/5*x= 6 3/4 /:2 2/5
x = 6 3/4 : 2 2/5 = 27/4 : 12/5 = 27/4 * 5/12 = 45/16 = 2 13/16
2010-02-17T12:54:00+01:00
X- szukana liczba

a) 2/7x= 13/5 / :2/7
x= 9,1

b) 3/4x= 31,2 / : 3/4
x= 41,6

c)11/3x= 6 / : 11/3
x= 18/11

d) 2 2/5 x= 6 3/4 / : 22/5
x= 15,75