Odpowiedź:
a)
1/4 - 28
1 - x
x/28 = 1 : 1/4
x = 4 * 28 = 112
b)
3/10 - 120
x/120 = 1 : 3/10
x = 10/3 * 120 = 10 * 40 = 400
c)
4/15 - 75
x/75 = 1 : 4/15
x = 15/4 * 75 = 1125/4 = 281,25
d)
2/7 - 10
x/10 = 7/2
x = 2/7 * 10 = 20/7 = 2 6/7
e)
13/2 - 260
x/260 = 2/13 * 260 = 20
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Odpowiedź:
a)
1/4 - 28
1 - x
x/28 = 1 : 1/4
x = 4 * 28 = 112
b)
3/10 - 120
1 - x
x/120 = 1 : 3/10
x = 10/3 * 120 = 10 * 40 = 400
c)
4/15 - 75
1 - x
x/75 = 1 : 4/15
x = 15/4 * 75 = 1125/4 = 281,25
d)
2/7 - 10
1 - x
x/10 = 7/2
x = 2/7 * 10 = 20/7 = 2 6/7
e)
13/2 - 260
1 - x
x/260 = 2/13 * 260 = 20
Szczegółowe wyjaśnienie: