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napisał liczbę 10
4x=40/:4
x=10
2.
0,5x+0,25x+0,125x=21
0,875x=21
x=24
Te liczby to:
10,9,8,7
Zadanie 2
Ta liczba to 24 bo 24:2 to 12,24:4 to 6 i 24:8 to 3 czyli 12+6+3=21