<span>(2x+3)(3x-2)-(1-3x)(3-2x)=7
6х^2-4x+9x-6-3+2x+9x-6x^2=7
16x=16
x=1</span>
Log(3)125-log(3)20+log(3)36=log(3)(125*36/20)=log(3)(25*9)=
=2log(3)5+2
1) n^2-m^2
4) 3^2-c^2=9-c^2
6)a^2-7^2=a^2-49
8)a^2-2/9^2=a^2 - 4/81
10) 0,4^2-m^2= 0,16-m^2
12)d^2-2,2^2=d^2-4,84