" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
x²-10x+3x-30=x²-170
-7x=-140
7x=140/:7
x=20
x+3=23
x-10=10
Obwód: 2*23 + 2*10=66