P=(a+b)*2
a=n
b=3/4n
P=(n+3/4n)*2=(1 3/4n)*2=14/4n=7/2n=3 1/2n=3,5n
1.
1) x = 17- 3y
2) -(17-3y) + 2y = 13
3y - 17 +2y = 13
5y = 13 + 17
5y = 30
y = 6
3) x = 17 - 3*6
x = 1
4) x - y = 1 - 6 = -5
(2х-4)(3-ч)=0
2х-4=0⇒2х=4⇒х=2
3-х=0⇒х=3
4-х=х⇒х+х=4⇒2х=4⇒х=2
общий корень х=2
203396г = 203.396кг
203396кг = 2033.96ц
203396ц = 20339.6т