巧算数学
(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)(10x9x8x7x6-5x4x3x2x1)/(3x4x5x6x)(1x2x3x4x5x6+6x7x8...
(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)
(10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6x)
(1x2x3x4x5x6+6x7x8x9x10x11) / (1x2x3x4x5x6) 展开
(10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6x)
(1x2x3x4x5x6+6x7x8x9x10x11) / (1x2x3x4x5x6) 展开
2013-05-10 · 知道合伙人教育行家
wangcai3882
知道合伙人教育行家
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本人擅长中学阶段数、理、化、生等理科知识,尤其是数学。高中时曾参加全国数学竞赛并获奖,期望能为你答疑
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解:
(1)
(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)
=(1x2x2x2x3x2x4x2x5x2+1x3x5x7x9)/(1x2x3x4x5)
=[1x2x3x4x5x(2x2x2x2x2)+1x3x5x7x9]/(1x2x3x4x5)
=2x2x2x2x2+1x3x5x7x9/(1x2x3x4x5)(进行约分)
=32+7x9/(2x4)
=32+63/8
=39.875
(2)
(10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6)
=(10x9x8x7x6)/ ( 3x4x5x6)-5x4x3x2x1/ (3x4x5x6)(进行约分)
=(5x3x4x7)-1/ 3
=420-1/3
=419又2/3
(3)
(1x2x3x4x5x6+6x7x8x9x10x11) /(1x2x3x4x5x6)
=(1x2x3x4x5x6)/( 1x2x3x4x5x6)+(6x7x8x9x10x11)/ (1x2x3x4x5x6)
=1+(6x7x8x9x10x11) /(1x2x3x4x5x6)(进行约分)
=1+7x2x3x11
=1+462
=463
(1)
(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)
=(1x2x2x2x3x2x4x2x5x2+1x3x5x7x9)/(1x2x3x4x5)
=[1x2x3x4x5x(2x2x2x2x2)+1x3x5x7x9]/(1x2x3x4x5)
=2x2x2x2x2+1x3x5x7x9/(1x2x3x4x5)(进行约分)
=32+7x9/(2x4)
=32+63/8
=39.875
(2)
(10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6)
=(10x9x8x7x6)/ ( 3x4x5x6)-5x4x3x2x1/ (3x4x5x6)(进行约分)
=(5x3x4x7)-1/ 3
=420-1/3
=419又2/3
(3)
(1x2x3x4x5x6+6x7x8x9x10x11) /(1x2x3x4x5x6)
=(1x2x3x4x5x6)/( 1x2x3x4x5x6)+(6x7x8x9x10x11)/ (1x2x3x4x5x6)
=1+(6x7x8x9x10x11) /(1x2x3x4x5x6)(进行约分)
=1+7x2x3x11
=1+462
=463
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(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)
解,得:
==[2(1*2*3*4*5)+1*3*5*7*9)]/(1*2*3*4*5)
==[2(1*2*3*4*5)/(1*2*3*4*5)]+[(1*3*5*7*9)/(1*2*3*4*5)]
==2+(63/8)
==9.875
(10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6x)
解,得:
==[(10x9x8x7x6)/( 3x4x5x6x)]-[(5x4x3x2x1)/( 3x4x5x6x)]
==84-3
==81
(1x2x3x4x5x6+6x7x8x9x10x11) / (1x2x3x4x5x6)
解,得:
==[(1x2x3x4x5x6)/(1x2x3x4x5x6)]+[(6x7x8x9x10x11)/(1x2x3x4x5x6)]
==1+462
==463
解,得:
==[2(1*2*3*4*5)+1*3*5*7*9)]/(1*2*3*4*5)
==[2(1*2*3*4*5)/(1*2*3*4*5)]+[(1*3*5*7*9)/(1*2*3*4*5)]
==2+(63/8)
==9.875
(10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6x)
解,得:
==[(10x9x8x7x6)/( 3x4x5x6x)]-[(5x4x3x2x1)/( 3x4x5x6x)]
==84-3
==81
(1x2x3x4x5x6+6x7x8x9x10x11) / (1x2x3x4x5x6)
解,得:
==[(1x2x3x4x5x6)/(1x2x3x4x5x6)]+[(6x7x8x9x10x11)/(1x2x3x4x5x6)]
==1+462
==463
追问
不对啊!
追答
(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)
解,得:
==[(2x4x6x8x10)+1*3*5*7*9)]/(1*2*3*4*5)
==[(2x4x6x8x10)/(1*2*3*4*5)]+[(1*3*5*7*9)/(1*2*3*4*5)]
==32+(63/8)
==39.875
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(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)
=【2(1×2×3×4×5)+1×3×5×7×9)/(1×2×3×4×5)
=2+63/8
=9又8分之7
(10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6x7)
=12-1/21
=11又21分之20
(1x2x3x4x5x6+6x7x8x9x10x11) / (1x2x3x4x5x6)
=1+462
=463
=【2(1×2×3×4×5)+1×3×5×7×9)/(1×2×3×4×5)
=2+63/8
=9又8分之7
(10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6x7)
=12-1/21
=11又21分之20
(1x2x3x4x5x6+6x7x8x9x10x11) / (1x2x3x4x5x6)
=1+462
=463
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(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)
(2*4*6*8*10+1*3*5*9)
=-------------------------------------
(1*2*3*4*5)
=1929
(2*4*6*8*10+1*3*5*9)
=-------------------------------------
(1*2*3*4*5)
=1929
追问
No
追答
是的,这是按分数的形式来解答的
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