看看今天的的lateX
∑i=1n,∑j=in,∑k=jn,ai+bj<=ck\sum_ {i = 1}^n, \sum_{j = i} ^ n, \sum_{k = j} ^n, a_i + b_j <= c_k∑i=1n,∑j=in,∑k=jn,ai+bj<=ck
∫57f(x) dx=???\displaystyle \int_5^7 f(x) \mathop{}\!\mathrm{d} x = ???∫57f(x)dx=???
wyy,jbl!
