$4x^2+3x+6=0$
$x=2,h=4$
$9x^4-30^3y+25x^2y^2$
$2\sin2x=\sin x$
$3x+11\le14x+8$
$\frac{0.08}{1.7196}5208$
$5-2.1s+17s$
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