1/4+( )=1/3 1/5+( )=2/9 ( )+3/4=9/8 ( )-5/8=1/12
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1/4+()=1/31/5+()=2/9()+3/4=9/8()-5/8=1/121/4+()=1/31/5+()=2/9()+3/4=9/8()-5/8=1/121/4+()=1/31/5+()=2
1/4+( )=1/3 1/5+( )=2/9 ( )+3/4=9/8 ( )-5/8=1/12
1/4+( )=1/3 1/5+( )=2/9 ( )+3/4=9/8 ( )-5/8=1/12
1/4+( )=1/3 1/5+( )=2/9 ( )+3/4=9/8 ( )-5/8=1/12
1/4+(1/12)=1/3 1/5+(1/45)=2/9 (3/8)+3/4=9/8 (3/4)-5/8=1/12
2*()=1/4/()=5*()=1/3*()=()
3/1乘4/1=( )乘5/1?
1.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=2.(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)=
计算100×(1-1/3)×(1-1/4)×(1-1/5)×…×(1-1/100)=?
1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=?
填空(填数字)(1/2-1)(1/3-1)=( )×( )=( );(1/2-1)(1/3-1)(1/4-1)=( )×( )×( )=( );(1/2-1)(1/3-1)(1/4-1)(1/5-1)=( )×( )×( )×( )=( );例:(1/2-1)(1/3-1)=( )×( )=( )前两个括号填1/2-1的结果
数学题(+1/5)-(+1/4)+(-3/5)-(-6又3/4)=?
( )x 1/20=4/5+( )=( )÷3/4=1
1/6【1/4{1/3(1/2X-1)+3}+5】=1
4/3×-()=2/5×()=12/7×()=5×()=1
(1-2)(1-3)(3-4)(4-5)...(19-20)=
(1-1/2)+ (1/3-1/4)+ (1/5-1/6)...+ (1/99-1/100)=?
3/4×()=2/7÷()=()×0.2=3-()=()+1/5=1
填时间量词3()+7()=1() 5()+2()=1() 5()+19()=1() 4()+8()=1()
(1/7)*() =(1/9)*()=(1/3)/()=(2/5)+()=()-(1/4)
1 2 3 4 5=1 (填符号)
(1+1/2)*(1+1/4)*.(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)=?请写出过程和道理!
数学题(1/4+1/5+1/6+...+1/671)(1/3+1/4+1/5+..+1/670)-(1/3+1/4+1/5+...+1/671)(1/4+1/(1/4+1/5+1/6+...+1/671)(1/3+1/4+1/5+..+1/670)-(1/3+1/4+1/5+...+1/671)(1/4+1/5+1/6+...+1/670)=?