2/1=1-2/1,6/1=2/1-3/1,12/1=3/1-4/1.根据以上规律计算下面题目 2/1+6/1+12/1+20/1+30/1

1+1/2+18/6/3=? 1+2+3/6+1/4= 巧算：(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)===== 1*2*3+1-1+1/6=? (2/3-1/2+1/6)除以1/24= 2-2x-1/6=x+1/3+1 1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=? (-2)-(+2/3)=?-2/3-(-1/6)=?（-1/2）-1/3=? 已知1/2=1-1/2,1/6=1/2-1/3,请计算1/2-1/6-1/12-1/20...-1/132 已知1/2=1-1/2,1/6=1/2-1/3,1/12=1/3-1/4.计算1/2+1/6+1/12+1/201/30+1/42+1/56+1/72+1/90=? 1-1/2+1/3-1/4+1/5-1/6+…+1/15=23*[1/( )+1/( )+1/( )+1/( )] 1/2+1/3+1/4+1/5+1/6+1/7+.1/20= 因为1-2/1=2/1,2/1-3/1=6/1,3/1-4/1=12/1,所以2/1+6/1=1-2/1+2/1-3/1=1-3/1=3/2 2/1+6/1+12/1=1-2/1+2/1-3/1+3/1-4/1=1-4/1=4/3 1/2=1/1-1/2;1/6=1/2-1/3;1/12=1/3-1/4.根据以上规律,计算：1/2+1/6+1/12+20/1+30/1+1/42+1/561/2=1/1-1/2;1/6=1/2-1/3;1/12=1/3-1/4.根据以上规律,计算：1/2+1/6+1/12+1/20+1/30+1/42+1/56 已知1-2/1=2/1,2/1-3/1=6/1,3/1-4/1=12/1+49*50/1 已知1=1/2=1/2,1/2-1/3=1/6,1/3-1/4=1/12.根据这些等式求值,1/1*2+1/2*3+1/3*4+...+1/49*50是多少? 2+1+2+6= 1/4-1/5=1/18+1/6=1/2-1/8=7/11+5=1/3+1/4=2-1/3=