<span>x²y + xy² -2x -2y=ху(х+у)-2(х+у)=(ху-2)(х+у)</span>
(у+2)²-4у²=(у+2)²-(2у)²=((у+2)+2у)((у+2)-2у)=(у+2+2у)<span>(у+2-2у)</span>=(2+3y)(2-y)
64 =4*4*4=4³
log9 log4 16 =log9 3=1/2
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log9 16 - log27 8 =log3² 4² - log3³ 2³ =log3 4 -log3 2 =log3 (4/2) =log3 2
3^ (log3 2)=2^(log3 3) =2