2/7=1/( )+1/( )+1/( ) 括号里填不同的数
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2/7=1/()+1/()+1/()括号里填不同的数2/7=1/()+1/()+1/()括号里填不同的数2/7=1/()+1/()+1/()括号里填不同的数2/7=1/4+1/84+1/421/71/
2/7=1/( )+1/( )+1/( ) 括号里填不同的数
2/7=1/( )+1/( )+1/( ) 括号里填不同的数
2/7=1/( )+1/( )+1/( ) 括号里填不同的数
2/7=1/4+1/84+1/42
1/7 1/14 1/14
1/7*2+1/7*4+1/7*8+1/7*16+1/7*32+1/7*64=?用拆项法解
9/1+7/2+12/1=
7-3/2(x-1)=1
1+2分之7=?
7 1/2-x=1 1/2
解方程1/7{1/2[1/5(x-2/2+1)-1]+x}=1
1+2+5+4+7+7=
7*lg20×(1/2)*lg0.7=
1/2+1/3+1/4+1/5+1/6+1/7+.1/20=
1/3^2-1+1/5^2-1+1/7^2-1...+1/(2n+1)^2-1+...=
1/1*3=1/2(1-1/3)1/3*5=1/2(1/3-1/5)1/5*7=1/2(1/5-1/7).1/17*19=1/2(1/17-1/19)所以1/1*3+1/3*5+1/5*7+.1/17*19=1/2(1-1/3)+1/2(1/3+1/5)+1/2(1/5-1/7)+.1/2(1/17-1/19)=1/2(1-1/3+1/3-1/5+1/5-1/7+1/7.+1/17-1/19)=1/2(1-1/1
因为1/1*3=1/2*(1-1/3),1/3*5=1/2*(1/3-1/5),1/5*7=1/2*(1/5-1/7),.,1/17*19=1/2*(1/17-1/19)所以1/1*3+1/3*5+1/5*7+...+1/17*19=1/2*(1-1/3)+1/2*(1/3-1/5)+1/2*(1/5-1/7)+...+1/2*(1/17-1/19)=1/2*(1-1/3+1/3-1/5+1/5-1/7+...+1/17-1/19)=1/2*(1-1/19)=9/19(1
1/7>( )>( )>2/7
5-1-1-7-2-1-8-6=?
1/7(X-1)=2/21(X+3.6-1)
x-1-7/1(x-1)=x/2
5x+1/2-1=7x-1/3
一元二次方程(1+12%)(1+7%)=(1+x%)^2