9 / 20 * 2 /3
9 * 2 / 20 * 3
18 / 20 * 2
18 / 60
упростить
3 / 10
=
_________________
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9 / 20 * 2 /3
9 * 2 / 20 * 3
18 / 20 * 2
18 / 60
упростить
3 / 10
=
_________________