28:−1428:-1428:−14
2x−74x+8−3≤0\frac{2x-7}{4x+8}-3\le04x+82x−7−3≤0
1+tan(x)=tan2(x)+2tan(x)1+tan(x)1+tan\left(x\right)=\frac{tan^2\left(x\right)+2tan\left(x\right)}{1+tan\left(x\right)}1+tan(x)=1+tan(x)tan2(x)+2tan(x)
2x−6x2−4.x2+4x+4x2−6x+9\frac{2x-6}{x^2-4}.\frac{x^2+4x+4}{x^2-6x+9}x2−42x−6.x2−6x+9x2+4x+4
21z2+11z−2 21z^2+11z-2\:21z2+11z−2
−51 +−84-51\:+-84−51+−84
3,7x−10,2 . 3,7x−10,2\:3,7x-10,2\:.\:3,7x-10,23,7x−10,2.3,7x−10,2
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