计算:1/(1x4)+1/(4x7)+1/(7x10)…+1/(298x301)
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计算:1/(1x4)+1/(4x7)+1/(7x10)…+1/(298x301)
计算:1/(1x4)+1/(4x7)+1/(7x10)…+1/(298x301)
计算:1/(1x4)+1/(4x7)+1/(7x10)…+1/(298x301)
1/1X4 = (1/1 - 1/4)/3
1/4X7 = (1/4 - 1/7)/3
...
1/298X301 = (1/298 - 1/301)/3
1/1X4+1/4X7+1/7X10+.+1/298X301
=(1/1-1/4 + 1/4 - 1/7 + ...+ 1/298 - 1/301)/3
=(1-1/301)/3
=100/301
计算:1/(1x4)+1/(4x7)+1/(7x10)…+1/(298x301)
计算1/1x4+1/4x7+1/7x10+***+1/2007x2010
计算 1X4分之一+4x7分之一+7x10分之一+...+2008x2011分之一的值
1/1x4+1/4x7+…+1/97x100
问道数学算术题!必须用简便计算!过程结果都要有!1/(1x4)+1/(4x7)+1/(7x10)+1/(10x13)+1/(13x16)
有理数的计算(1)1/1x4+1/4x7+1/7x10+...+1/2008x2011+1/2011x2014
计算1/1X4+1X7+ 1/7x10+...+1/2008X2011的值是多少
计算:1x4分之一+4x7分之一+7x10分之一+10x13分之一+13x16分之一等于多少?
1/1X4+1/4X7+1/7X10+1/10X13+1/13X16(简算)
x1-x2+x3=1x2-x3+x4=21若x1,x2,x3,x4,x5满足方程组 x3-x4+x5=3x4-x5+x1=4x5-x1+x2=5求x2 x3 x4的值2已知 x1+x4+x6+x7=39 x2+x4+x5+x7=49 x3+x5+x6+x7=41 x4+x7=13 x5+x7=14 x6+x7=9 x1+x2+x3+x4+x5+x6+x7=9求x7的值若x1,x2,x3,x4,x5满足方程组 x1-x
简便计算 1.0.125X8.8 2.10.1X8.3 3.(2.5+25)X4 4.3.57X3.7+3.57X7.3
x8+x7+x6 +x5+x4+x3+x2+x+1因式分解
x8+x7+x6+x5+x4+x3+x2+x+1因式分解
100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注:1x4、4x7、7x10等均为分母的大小
1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 简便
1/1x4+1/4x7+1/7x10+……+1/2005x2008佼佼我
1/1X4+1/4X7+1/7X10+...+1/100X103=
1/1x4+1/4x7+1/7x10+……+1/97x100SOS!SOS!