0.162\sqrt[2]{0.16}20.16
x(3x −1) −20 < 2 (3x+1)x\left(3x\:-1\right)\:-20\:<\:2\:\left(3x+1\right)x(3x−1)−20<2(3x+1)
−8−(−6−5−4)-8-\left(-6-5-4\right)−8−(−6−5−4)
5n+1+5n+2+5n+3+5n+4=7805^{n+1}+5^{n+2}+5^{n+3}+5^{n+4}=7805n+1+5n+2+5n+3+5n+4=780
13(12x+6)−x\frac{1}{3}\left(12x+6\right)-x31(12x+6)−x
−x2+x+7-x^2+x+7−x2+x+7
a+13=1a+3a+\frac{1}{3}=\frac{1}{a+3}a+31=a+31
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