\(\int_0^{\infty}\!\sum{\sum_{\placeholder{}}^{\dfrac{\mathrm{d}}{\mathrm{d} x}\mathrm{d}x\prod_{\placeholder{}}^{\iiint\iint\oint\epsilon\gamma\eta\beta\beta\omega\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}}}}\,\mathrm{d}x\)

xích mích với ai?

\(\varphi\alpha\zeta\varepsilon\varsigma\sigma\chi\vartheta\epsilon\delta\psi\varkappa\rho\phi\gamma\omega\varpi\tau\eta\beta\varpi\varrho\upsilon\xi\nu\mu\kappa\iota\omicron\pi\lambda\) \(\int_0^{\infty}\!\int_{\placeholder{}}^{\int\iint\iiint\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\placeholder{}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}}\,\mathrm{d}x\)

\(\sum\limits{\sum_{\placeholder{}}^{\mathrm{d}x\frac{\partial}{\partial x}\dfrac{\mathrm{d}}{\mathrm{d}x}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\varphi\varsigma\epsilon\rho\tau\upsilon\theta\iota\omicron\pi\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}}}\)

không biết đánh dấu à?

\(\int_0^{\infty}\!\int_{\placeholder{}}^{\int\int\iint\iiint\oint\partial\frac{\partial}{\partial x}\dfrac{\mathrm{d}}{\mathrm{d}x}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}}\,\mathrm{d}x\)

đố làm được\(\int_0^{\infty}\!\int_{\placeholder{}}^{\int\iint\iiint\oint\partial\frac{\partial}{\partial x}\dfrac{\mathrm{d}}{\mathrm{d}x}\begin{cases}\begin{cases}\begin{cases}\left[\begin{array}{l}\left[\begin{array}{l}\left[\begin{array}{l}\placeholder{}\\ \placeholder{}\end{array}\right.\\ \placeholder{}\\ \placeholder{}\end{array}\right.\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{array}\right.\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}}\,\mathrm{d}x\)

\(\int_{\placeholder{}}^{\int_0^{\infty}\!\int\iint\iiint\partial\frac{\partial}{\partial x}\int_{\placeholder{}}^{\dfrac{}{\mathrm{d}x}}\,\mathrm{d}x}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\begin{cases}\placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\)

\(\int_0^{\infty}\!\int_{\placeholder{}}^{\int\iint\iint\iiint}\,\iiint\iint\oint\begin{cases}\begin{cases}\begin{cases}\placeholder{}\\ \placeholder{}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\\ \placeholder{}\end{cases}\\ \placeholder{}\end{cases}\)

\(\int_0^{\infty}\!\mathrm{d}x\int_{\placeholder{}}^{\int\dfrac{\mathrm{d}}{\mathrm{d}x}\frac{\partial}{\partial x}\iint\iiint\partial\oint}\,\mathrm{d}x\)