4.6х +5.8=6.5*1.6
4.6х+5.8= 10.4
4.6х=10.4-5.8
4.6х=4.6
х=1
Решение:
-2х-36=8х+44
-2х-8х=44+36
-10х=80
х=80 : -10
х=-8
Ответ: х=-8
P=2*(a+b)=2*(8+(8-4))=24;
Ширина: 8-4=4см;
S=a*b=8*4=32
3 : 1/9 = 3 * 9/1 = 27
4 : 3/8 = 4 * 8/3 = 32/3 = 10 2/3
9 : 3/7 = 9 * 7/3 = 21
2 : 1 1/3 = 2 : 4/3 = 2 * 3/4 = 3/2 = 1 1/2