5/7*1/6+4/17*5/9+5/18*6/17等于多少？（用简算方法）要过程

5/17*1/6+4/17*5/9+5/18*6/17等于多少？（用简算方法）要过程

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(5/7)*(1/6)+(4/17)*(5/9)+(5/18)*(6/17)
=(5/7)*(1/6)+(5/17)*(4/9)+(5/17)*(6/18)
=(5/7)*(1/6)+(5/17)*(4/9+6/18)
=(5/明宴如祥宽7)*(1/6)+(5/17)*(7/9)
=(5/7)*(1/6)+(5/7)*(17/9)
=(5/7)*(1/6+17/9)
=(5/激启7)*(37/18)
=185/126

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5/7应为5/汪孝世17

5/17*1/6+4/困肢17*5/9+5/18*6/17
=5/17*1/6+5/17*4/9+6/18*5/17

=5/17*(1/6+4/9+1/3)

=5/17*17/慎乎18
=5/18

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