2x3十4x6十6x9十8x12十10x15分之1x2十2x4十3x6十4x8十5x10.

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2x3十4x6十6x9十8x12十10x15分之1x2十2x4十3x6十4x8十5x10.

2x3十4x6十6x9十8x12十10x15分之1x2十2x4十3x6十4x8十5x10.
2x3十4x6十6x9十8x12十10x15分之1x2十2x4十3x6十4x8十5x10.

2x3十4x6十6x9十8x12十10x15分之1x2十2x4十3x6十4x8十5x10.
115分之59

2x3十4x6十6x9十8x12十10x15分之1x2十2x4十3x6十4x8十5x10。
=6(1+4+6+9+16+25)分之2*(1+4+6+9+16+25)
=1/3

=(1x2+2x1x2+3x1x2+4x1x2+5x1x2)/(2x3+2x2x3+3x2x3+4x2x3+5x2x3)
=15x1x2/(15x2x3)
=1/3