01 Íàéäèòå çíà÷åíèå âûðàæåíèÿ .
ÐÅØÅÍÈÅ
(24/7)/(12/21)-1.7
http://www.wolframalpha.com/input/?i=%2824%2F7%29%2F%2812%2F21%29-1.7
=
ÎÒÂÅÒ
4.3