3/5x5+3/5x8+……+3/1997x2000+3/2000x2003 /是分号
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3/5x5+3/5x8+……+3/1997x2000+3/2000x2003/是分号3/5x5+3/5x8+……+3/1997x2000+3/2000x2003/是分号3/5x5+3/5x8+……+3
3/5x5+3/5x8+……+3/1997x2000+3/2000x2003 /是分号
3/5x5+3/5x8+……+3/1997x2000+3/2000x2003 /是分号
3/5x5+3/5x8+……+3/1997x2000+3/2000x2003 /是分号
3/5x5+3/5x8+……+3/1997x2000+3/2000x2003
=3(1/5x5+1/5x8+……+1/1997x2000+1/2000x2003 )
=3[1/25+(1/5-1/8)+(1/8-1/11)+……+(1/1997-1/2000)+(1/2000-1/2003) ]
=3(1/25+1/5-1/8+1/8-1/11+……+1/1997-1/2000+1/2000-1/2003)
=3(1/25+1/5-1/2003)
=3(6/25-1/2003)
3/5x5+3/5x8+……+3/1997x2000+3/2000x2003 /是分号
3/2X5+3/5X8+……+3/1997X2000+3/2000X2003
3x8+4x8+5x8+6x8+7x8+8x8+9x8+10x8 的简便运算
1x5+2x5+3x5+4x5+5x5… 麻烦给我一个公式.
3/2X5+3/5X8+3/8X11+.+3/1997X2000+3/2000X2003=
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画出求1X3+ 2X4+ 3X5+ 4X6+ 5X7+ 6X8+ 7X8的值的程序框图
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
1/1x3+1/2x4+1/3x5+1/4x6+1/5x7+1/6x8
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9=
1/2x5 +1/5x8 +1/8x11+……+1/2009x2012=?
0.7x8/5+0.3x8/3简便运算
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简便计算 1/5x8除以4/5 (26+26/53)除以13 (2/5-1/3)x5/2简便计算 1/5x8除以4/5(26+26/53)除以13(2/5-1/3)x5/224x5/36-3/82/5除以(2/5+3/4)2/11除以1/9除以19/22
1.(-5)+21x8/2-6-592.(-2)/9-7/9-563.(-2)x8-8x1/2+8/1/84.(-9)x5/6+5/65.1/2+3+5/6-7/12
min 3x1+16x2+16x3+50x4+39x5+52x6+45x7+10x8+15x9s.t.56x1+113x4+109x6+179x7+56x8+34x9>=9049x2+45x5>=6060x1+46x3+46x8>=8025x1+7x6+8x7+8x8+5x9>=9040x1+275x4+110x6+55x7>=60x1
数列1/2X5,1/5X8,1/8X11,、、、1/[(3N-1)X(3N+2)]的前N项和是
1.5X8.4+3X10分之3+25X10%= 4.5÷(24又7分之5-2.5%X800= 7.5X5分之4-5.5X80%+0.4=