1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+...+1/(3+6+9+...+150)=?
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1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+...+1/(3+6+9+...+150)=?1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+...+1/(3+6+9+..
1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+...+1/(3+6+9+...+150)=?
1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+...+1/(3+6+9+...+150)=?
1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+...+1/(3+6+9+...+150)=?
1/3+1/(3+6)+1/(3+6+9)+...+1/(3+6+9+...+150)
=1/3+1/[3*(1+2)]+1/[3*(1+2+3)]+...+1/[3*(1+2+3+...+50)]
=2/3*[1/(1*2)+1/(2*3)+1/(3*4)+...+1/(50*51)]
=2/3*[1-1/2+1/2-1/3+1/3-1/4+...+1/50-1/51]
=2/3*[1-1/51]
=2/3*50/51
=100/153
10/9-(5/3+6/1)
1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+...+1/(3+6+9+...+150)=?
1/3+1/(3+6)+1/(3+6+9)+……+1/(3+6+9+……+99)=?
2/3,1/3,2/9,1/6,)
(2/9-1/3+1/6)×(-18)
数学计算题(3+5/9-2/3)×(1/6+1/9+1/12)-(1/6-1/9+1/12)×3+(1/6+1/9+1/12)×(2/3-5/9)谢谢来答
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
7/2+9/4+(-1/3)-0.25+(-1/6)
2/9除以【(1/2+1/6)*3/4】
[5/6-(1/2-1/3)]×9/10
1 .(5x+1)/6=(9x+1)/8-(1-x)/3
3/4÷[(2/3-1/6)×9]
1,2,4,3,6,9,(),()
(2 -1 -1 1; 1 1 -2 1; 3 6 -9 7 )化为最简形矩阵
(-3)的二次方-1/6×5+1/6×(-3的二次方)9-1/6×5+1/6×(-9)
简便计算-1.35*(-6)+3.85*(-6)-(9/7-6/5+3/1)*18
1/6÷(2/9+1又1/3)×(8-3又1/3);(0.2+1/3)×4.5÷(7.05+6又9/20)
(-1)+2+(-3)+4+...+(-99)+1003+(-6)+6+(-9)+9+...+27+(-30)