1/4-1/5=1/18+1/6=1/2-1/8=7/11+5=1/3+1/4=2-1/3=

1/4-1/5=1/18+1/6=1/2-1/8=7/11+5=1/3+1/4=2-1/3= 1+1=1,2+1=1,3+4=1,4+9=1,5+7=1,6+18=1 脑筋脑筋急转弯 如何解释1+1=1；2+1=1；3+4=1；4+9=1；5+7=1；6+18=1 如何解释1+1=1；2+1=1；3+4=1；4+9=1；5+7=1；6+18=1 2( )+1( )=1( ) 5( )+7( )=1( ) 3( )+4( )=1( ) 6( )+18( )=1( )加量词 1/2×2+1/4×3+1/6×4+1/8×5+…1/18×10=? 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)===== 1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=? 1-1/2+1/3-1/4+1/5-1/6+…+1/15=23*[1/( )+1/( )+1/( )+1/( )] 5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12在括号里写恰当的运算符号5/9[ ]1/2 =1/18 2/5[ ]1/4=13/20 1/2[ ]1/5[ ]1/10=4/5 1/4[ ]1/6=1/12 1+1/2+18/6/3=? 1/2+1/3+1/4+1/5+1/6+1/7+.1/20= 1*2*3*4分之1+2*3*4*5分之1+…+17*18*19*20分之1（计算题）1/1*2*3*4+1/2*3*4*5…………+1/17*18*19*20=1/2(1/1*4-1/2*3+1/2*5-1/3*4+1/3*6-1/4*5……1/17*20-1/18*19)=1/2(1/1*4+1/2*5+1/3*6……1/17*20-(1/2*3+1/3*4……1/18*19))=1/2*(1/3*(1- 1*2*3*4分之1 + 2*3*4*5 分之1+ .+17*18*19*20分之11*2*3*4分之1+2*3*4*5分之1+…+17*18*19*20 =(1/6)(1+1/2+1/3-1/18-1/19-1/20)-(1/2)(1/2-1/19) =(1/6)(11/6-1/18-1/19-1/20)-17/76=5729/20520-17/76=1139/20520 1/2+1/6+1/12+1/20+1/30+1/42= 2+4+6+...+2010= (5/9-5/6+1/4)÷(-1/36)= (-19 18/19)*38= 都用简便计算 1/2+1/6+1/12+1/20+1/30+1/42= 2+4+6+...+2010= (5/9-5/6+1/4)÷(-1/36)= (-19 18/19)*38= 都用简便计算 1/2{1/3[1/4(1/5x-1)-6]+4}=1 1/1*3+1/2*4+1/3*5+1/4*6+.+1/100*102=?