{1÷2=x3+4=y5*6=z73=wxy2e-iωtx21nYdydxΔyΔx∂y∂xδyδxπ2-b±b2-4ac2adx21dy21k(nk)0≤ i ≤ m0<j<n P(i,j)k=1nAkn=1m(XnYn)f(x)={-x, &x<0x, &x≥0(nk)nktanθ=sinθcosθAABCx⊕ylimn→∞(1+1n)nmax0≤x≤1xe-x2yields(1102030)