<span>(2x-3y)</span>² = 4х² - 12ху + 9у²
У=0.7х^2+1 график 4
у=-0.7х^2+1 график 2
у=0.7(х-1)^2 график 3
<span>у=-0.7(х-1)^2 график 1</span>
2ax/(a+x)(a-x)-x/(a+x)=2ax-x(a-x)/(a-x)(a+x)=(x^2+ax)/(a-x)(a+x)=x/a-x
2 3/7-4 3/7*8=17/7-31/7*8=(17-8*31)/7
(17-248)/7=-231/7=-33