18a−27a218a-27a^218a−27a2
4t2+39=04t^2+39=04t2+39=0
(xy2+x)+exy′=0\left(xy^2+x\right)+e^xy'=0(xy2+x)+exy′=0
∫18x281−x2dx\int\frac{18x^2}{\sqrt{81-x^2}}dx∫81−x218x2dx
9−(−15)+(−9)9-\left(-15\right)+\left(-9\right)9−(−15)+(−9)
12x2− x+3 ; x=−212x^2-\:x+3\:;\:x=-212x2−x+3;x=−2
x2−2x−7>5−xx^2-2x-7>5-xx2−2x−7>5−x
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