字典翻译 问答 小学 数学 (2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)(10x9x8x7x6-5x4x3x2x1)/(3x4x5x6x)(1x2x3x4x5x6+6x7x8x9x10x11)/(1x2x3x4x5x6)
问题标题:
(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)(10x9x8x7x6-5x4x3x2x1)/(3x4x5x6x)(1x2x3x4x5x6+6x7x8x9x10x11)/(1x2x3x4x5x6)
问题描述:

(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)

(10x9x8x7x6-5x4x3x2x1)/(3x4x5x6x)

(1x2x3x4x5x6+6x7x8x9x10x11)/(1x2x3x4x5x6)

雷亮回答:
  (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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