$cosx=\frac{1}{5}$
$5a\cdot5c$
$-3a+\left(1+5a\right)$
$-13-3\cdot2$
$\left(2^2\:.\:\:\:3^{-1}\:\right)^3$
$-1,34\:m^3+0,54\:m^7n^2-0,34\:m^3n-6,3\:m^7n^2$
$2x-1=5x+8$
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