shagi za gigi lolilillikl
3-5х-10-6+3х=0
-2х-13=0
-2х=13
х=-6,5
<span>X ^2 y^2 - 81 ;=(xy)^2-9^2=(xy-9)(xy+9)</span>
А + b + c - ( a - b - c ) = a + b + c - a + b + c = 2b + 2c
Ответ 2b + 2c
4a^2-<u>2ab</u>+b^2+a^2-<u>b^2</u>+<u>2ab</u>+3a^3+<u>b^2</u>-ab=5a^2+b^2+3a^3