1/18=1/( )+1/( ) 1/24=1/( )+1/( ) 1/16=1/( )+1/( )
(24+( ))x(( )/18/( ))=1
1+1+1-1=?.
x(1/12+1/24)=1
(1-1/4)(1-1/9)(1-1/16)(1-1/25)(1-1/36)(1-1/49)=?
A=1\10+1\11+1\12+1\13+1\+1\14+1\15+1\16+1\17+1\18+1\19分之1 求A
1-1-1-1-1--1-1----1-111-1-1-1-1-1-1--1---1-111111=
15/1+16/1+17/1+18/1+19/1=?
1+1=?智力题1+1=?
24(1/x+1/y)=1 18(1/x+1/ y)+10/x=1 求解这个方程组
1.1/24=1/()+1/()=1/()+1/()=1/()+1/() 填空,括号中的数字不同
(1/18 +1/24)×8+1/18 ×x=1
简便计算10*1/12+12*1/14+14*1/16+16*1/18=?