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6x一O点4X6二9点6解方程

6x一0.4*6=9.6解方程 解:6x-2.4=9.6 6x=12 x=12÷6 x=2

原题=1/2(1/2-1/4+1/4-1/6.......+1/98-1/100)=1/2(1/2-1/100)=49/200

1/2X4+1/4X6+1/6X8+1/8X10+1/10X12 =(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12)÷2 =(1/2-1/12)÷2 =5/12÷2 =5/24

2x4/1+4x6/1+6x8/1+…+2006x2008/1 =(2/1-4/2+4/1-6/1+6/1-8/1+……+2006/1-2008/1)÷2 =(2/1-2008/1)÷2 =2008/1003÷2 =4016/1003

1/(2*4)+1/(4*6)+1/(6*8)+......+1/(2006*2008) =1/2(1/2-1/4+1/4-1/6+1/6-1/8+.....+1/2006-1/2008) =1/2(1/2-1/2008) =1/2*1003/2008 =1004/4016

a = 2 b = 0 while ( a

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