Znajdz liczbe, ktorek 25 % jest rowne wartosci wyazenia :
a) 5 5/25 + 1,72
b) (4 2/3 - 3,25) : (3 1/3 . 2,5)
c) 0,7 + 4,2 : 0,1
d) 2 1/4 : 0,3 - 1,2
e) 1 1/5 + 5,8 x 1 1/4
f) 6,49 - 6/25 x 4 5/8
Ps. Ulamki zapisuje w postaci np. 1/2 itp., lub 1(cala) i 1/3
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a)
5 5/25 + 1,72 =
= 5,2 + 1,72 =
= 6,92
6,92 - 25%
x - 100%
x = 6,92 * 100% / 25%
x = 692 / 25
x = 27,68
=========================================
b) (4 2/3-3,25):(3 1/3-2,5) =
= (14/3 - 13/4) : ( 10/3 - 5/2) =
= (56/12 - 39/12) : (20/6 - 15/6) =
= 17/12 : 5/6 =
= 17/12 * 6/5 =
= 17/10 = 1,7
1,7 - 25%
x - 100%
x = 1,7 * 100% / 25%
x = 170 / 25
x = 6,8
================================================
c) 0,7 + 4,2 : 0,1 =
= 0,7 + 42 =
= 42,7
42,7 - 25%
x - 100%
x = 42,7 * 100% / 25%
x = 4270 / 25
x = 170,8
===========================================
d) 2 1/4 : 0,3 - 1,2 =
= 2,25 : 0,3 - 1,2 =
= 7,5 - 1,2 =
= 6,3
6,3 - 25%
x - 100%
x = 6,3 * 100% / 25%
x = 630 / 25
x = 25,2
===========================================
e) 1 1/5 + 5,8 * 1 1/4 =
= 1,2 + 5,8 * 1,25 =
= 1,2 + 7,25 =
= 8,45
8,45 - 25%
x - 100%
x = 8,45 * 100% / 25%
x = 845 / 25
x = 33,8
===============================================
f) 6,49 - 6/25 * 4 5/8 =
= 6,49 - 6/25 * 37/8 =
= 6,49 - 0,24 * 4,625 =
= 6,49 - 1,11 =
= 5,38
5,38 - 25%
x - 100%
x = 5,38 * 100% / 25%
x = 538 / 25
x = 21,52