5,谢谢!
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(1+1/2+1/4)x(1/2+1/4+1/6)-(1+1/2+1/4+1/6) x(1/2+1/4)
=(7/4)x(11/12)-(23/12)x(3/4)
=77/48 - 69/48
=8/48
=1/6
=(7/4)x(11/12)-(23/12)x(3/4)
=77/48 - 69/48
=8/48
=1/6
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