1/1*2*3+1/2*3*4+...+1/(48*49*50)
1+2+3+4+...+48+49+50+49+48+...+4+3+2+1=?
计算(50/1-1)(49/1-1)(48/1-1).(4/1-1)(3/1-1)(2/1-1)
(1/50)(1/49)(1/48).(1/4)(1/3)(1/2)这个数学题怎么做?
计算(50/1)(49/1)(48/1)…(4/1)(3/1)(2/1)的值
计算:(1/50-1)(1/49-1)(1/48-1)…(1/4-1)(1/3-1)(1/2-1)
计算 (50/1-1)(49/1-1)(48/1-1)...(4/1-1)(3/1-1)(2/1-1)
计算 (50/1-1)(49/1-1)(48/1-1)...(4/1-1) (3/1-1)(2/1-1)
1/(1×2)+1/(2×3)+1/(3×4).+1/(48×49)+1/(49×50)等于多少?
巧算 50-49+48-47+.+4-3+2-1=
巧算:50-49+48-47+…+4-3+2-1
1500-1-2-3-4-...-48-49-50如何运算
计算. (1/50-1)×(1/49-1)×(1/48-1)×```×(1/3-1)×(1/2-1)