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polina10091
@polina10091
July 2022
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найдите число b , если известно, что: 1) 30% от 30% числа b равны 7,2
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kristishka1111
100 - х
30 - 7,2х
30х = 720
х = 24
100 - х
30 - 24
30х = 2400
х = 80
0 votes
Thanks 1
Kolledgan
30% это 0.3
7.2:0.3=24
24:0.3 = 80
1 votes
Thanks 1
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Answers & Comments
30 - 7,2х
30х = 720
х = 24
100 - х
30 - 24
30х = 2400
х = 80
7.2:0.3=24
24:0.3 = 80