3⼀5×1⼀7×6⼀13+5⼀7×1⼀5×3⼀13+1⼀13×3⼀7×2⼀5简便计算

2024-11-22 03:21:41
推荐回答(2个)
回答1:

3/5×1/7×6/13+5/7×1/5×3/13+1/13×3/7×2/5=3/5×1/7×6/13+1/7×3/13+1/13×3/7×2/5=1/7(6/5×3/13+3/13)+1/13×3/7×2/5=1/7×3/13(6/5+1)+3/13×1/7×2/5=1/7×3/13(11/5+2/5)=1/7×3/13×13/5=3/35

回答2:

3/5×1/7×6/13+5/7×1/5×3/13+1/13×3/7×2/5
=1/5×1/7×1/13×(3×6+5×3+3×2)
=1/5×1/7×1/13×39
=3/35