![\frac{4}{3} x^2-48=0](https://tex.z-dn.net/?f=%20%5Cfrac%7B4%7D%7B3%7D%20x%5E2-48%3D0)
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![\frac{4}{3} x^2=48](https://tex.z-dn.net/?f=%20%5Cfrac%7B4%7D%7B3%7D%20x%5E2%3D48)
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![x^2= \frac{48*3}{4} =12*3=36](https://tex.z-dn.net/?f=%20x%5E2%3D%20%5Cfrac%7B48%2A3%7D%7B4%7D%20%3D12%2A3%3D36)
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![x= \sqrt{36}](https://tex.z-dn.net/?f=%20x%3D%20%5Csqrt%7B36%7D)
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![x= 6](https://tex.z-dn.net/?f=%20x%3D%206)
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![x= -6](https://tex.z-dn.net/?f=%20x%3D%20-6)
1. b/ac ---> (-1,5)/(2*0,9)=(-3/2)/(2*(9/10)=(-3/2)/(9/5)=(-1/2)/3/5)=(-5/6)
2. 6a+(4a-7)-(a+3)=6a+4a-7-a-3=9a-10
3. 1:4=5x:8
8=20x
x=8/20
x=2/5
<em>Производная от знаменателя равна 3х², поэтому д(х³+2)=3х²*дх.</em>
<em>Значит, ∫(х²/(х³+2))дх=(1/3)*∫(3х²/(х³+2))дх=(1/3)*∫(д(х³+2)/(х³+2))=</em>
<em>(1/3)*∫(ду/у)=(㏑у)/3+с=(</em><em>㏑(х³+2))/3+с</em>
<em>только логарифм надо по модулю у брать, а потом по модулю (х³+2)</em>