(3/7+3/8+5/9+7/10)/(3/8+7/10+3/7)=的过程与解答
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(3/7+3/8+5/9+7/10)/(3/8+7/10+3/7)
=1+(5/9)/(3/8+7/10+3/7)
=1+(5/9)/[3*(7+8)/(7*8)+7/10]
=1+(5/9)/[45/56+7/10]
=1+(5/9)/(321/280)
=1+1400/2889
=1+(5/9)/(3/8+7/10+3/7)
=1+(5/9)/[3*(7+8)/(7*8)+7/10]
=1+(5/9)/[45/56+7/10]
=1+(5/9)/(321/280)
=1+1400/2889
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