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x- szukana liczba
(1/2)x+(1/4)x+(1/8)x=21 mnożymy obustronnie przez 8
4x+2x+x=168
7x=168 /:7
x=24
4/8 + 2/8 + 1/8 = 21
7/8 = 21
1/8=3
8/8=1/1=24
1/4=2/8
1/8
x- pewna liczba
4/8x + 2/8x + 1/8x = 21
7/8x = 21 /*8
7x=168 /7
x=24
Odp: ta liczba to 24.
Dasz najj??