$\left(x\:\:mas\:3\right)\:\left(x\:mas\:7\right)$
$36\:x\:9$
$\sqrt{1+3a}=\sqrt{a+1}-\sqrt{a+2}$
$\frac{1}{243x\:4\:\left(3x\:2\:+1\right)+27x\:2\:+1\:}$
$-73\cdot102$
$10.29+3$
$3x+1\cdot2x+1$
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