1/5+1/4+3/11+2/7+5/17+3/10+7/23.有什么规律?求和

2-1/11-3/11-7/11 3/4-(1/5-1/4) 简便算啊. 24点3则：11,11,1,5；8,5,2,7；1,4,5,6. (6/5+9/11+1又5/7)/(3/11+2/5+4/7)简便计算 (-7)+11+3+(-2) 1/4+(-2/3)+5/6+(-1/4)+(-1/3)等于几 3/2*5+2/5*7+4/7*11+5/11*16+6/11*22+7/22*29+1/29 7/5+11/4+2/1= 2001×(1/7+十2/11+3/13+4/5) 1/2×4+1/3×5+1/4×6+1/5×7+……+1/8×10+1/9×11 1+2+3+4+5+6+7+7+6+5+4+3+2+1+7+8+8+7+19+11 1/3 1/2 5/11 7/18 1/3 （7 1/2-3 4/5）+（4 1/3-4 1/5）请简便运算1 1/11+3 2/11+5 3/11 +7 5/11+```````19 10/11 请简便运算··· 5/[4-根号(11)]+1/[3+根号(7)]-6/[根号(7)-2]-[根号(7)-5]/2 计算：2/3*5+1/5*7+1/7*9+1/9*11+1/11*13 2/5*7+4/7*11+6/16*22+3/2*5+5/11*16+7/22*29+1/29 1*2*3+2*3*4+3*4*5+5*6*7+.10*11*12 1*2*3+2*3*4+3*4*5+5*6*7+.10*11*12 1,4,9,16,( ),( ) 1,2,4,7,11( ),( ) 16,4,1,1/4 1/5,0.4,3/5,0.8( ),( ) 7,5,14,4,21,3( ),( ) 数学1-（5/2+3/1）,8/7-12/5+6/1,12/11-4/1-3/1,7/2+（9/4+7/5）写出过程