1+(1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1/2+1/3+1/4+1/5)×(1/2+1/3+1/4)=9~2y-a,f(F'u1\,@'z2v.L0c0P3i'M(A.u+G-Q)w7\+A:N:P)T)V+W
算式:提示5z3j)}1a9o+G+l8|+F-V)s5{/g8l,N+x(A.u+G-Q)w7\+A:N:P)T)V+W