第1个回答 2012-09-12
1/2×1/15+1/3×1/2
=1/2×(1/15+1/3)
=1/2×(1/15+5/15)
=1/2×6/15
=3/15=1/5
第2个回答 2012-09-12
1/2*1/15+1/3*1/2
=1/2*(1/15+1/3)
=1/2*(1/15+5/15)
=1/2*6/15=6/30
=1/5
第3个回答 2012-09-18
1/2×1/15+1/3×1/2
=1/2*1/(3*5)+1/3*1/2
=1/2*1/3*(1/5+1)
=1/5
第4个回答 2012-09-12
1/2×1/15+1/3×1/2
=1/(2×15)+1/(3×2)
=1/30+1/6
=1/30+5/30
=6/30
=1/5本回答被网友采纳