15问答网 > 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

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