−8−4+(3+9)−2−(3−5)-8-4+\left(3+9\right)-2-\left(3-5\right)−8−4+(3+9)−2−(3−5)
9x+1=3x+199x+1=3x+199x+1=3x+19
36−{32 +[−3+5(13−6)]} \sqrt{36}-\left\{3^2\:+\left[-3+5\left(13-6\right)\right]\right\}\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:36−{32+[−3+5(13−6)]}
49−14x49-14x49−14x
∫1x2(x2+2)dx\int\frac{1}{x^2\left(x^2+2\right)}dx∫x2(x2+2)1dx
x+12=9x+12=9x+12=9
(2a23)\left(\frac{2}{a^2}^3\right)(a223)
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