10.1,21.4,11.3,33.4的平均数是什么？
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脱式计算
（3/4+1/6）*2/3
=3/4*2/3+1/6*2/3
=1/2+1/9
=11/18
25*1/5-5*1/5
=5-1
=4
6/11*7/15*10
=84/33
=28/11
（1/7+1/4）*28
=1/7*28+1/4*28
=4+7
=11
(21+2/5)*5/7
=21*5/7+2/5*5/7
=15+2/7
=15又2/7
39*7/13*2/3
=14
（3/4+1/6）*2/3
=3/4*2/3+1/6*2/3
=1/2+1/9
=11/18
25*1/5-5*1/5
=5-1
=4
6/11*7/15*10
=84/33
=28/11
（1/7+1/4）*28
=1/7*28+1/4*28
=4+7
=11
(21+2/5)*5/7
=21*5/7+2/5*5/7
=15+2/7
=15又2/7
39*7/13*2/3
=14
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