M
math012


1/ $\sqrt{5x^2-14x+9}$ -$\sqrt{x^2-x-20}$=5$\sqrt{x+1}$
2/$x^2$+(3-$\sqrt{x^2+2}$)x=1+2$\sqrt{x^2+2}$
3/ (x+1)$\sqrt{x^2-2x+3}$= $x^2$+1
4/13$\sqrt{x^2-x^4}$ +9$\sqrt{x^2+x^4}$=16
2/$x^2$+(3-$\sqrt{x^2+2}$)x=1+2$\sqrt{x^2+2}$
3/ (x+1)$\sqrt{x^2-2x+3}$= $x^2$+1
4/13$\sqrt{x^2-x^4}$ +9$\sqrt{x^2+x^4}$=16
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