<span>a^2*x^2+3x-3a^2*x+4-4a^2-x^2=(a-1)*(a+1)*(x-4)*(x+1)</span>
6*3^x-6*3^x/3-3^x=3^2
6*3^x-2*3^x-3^x=3^2
3*3^x=3*3
3^x=3^1
x=1
5*5^x+0,6*5^x-6*5^x+10=0
-0,4*5^x=-10
5^x=25=5^2
x=2
8-100\%
6-x
8x=6*100
8x=600:8
x=75(\%)-уменьшилась
100-75=25(\%)
<span> (3х-4у)(3х+4у)=<span>9х²-16у²</span></span>