用简便方法计算下面各题. 递等式计算、谢谢了!
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/06/30 16:19:53
用简便方法计算下面各题. 递等式计算、谢谢了!
(5/6-5/9)×36 (24+1/5)×5/6 15/17×4/5×17/30
5/7×6/13+7/13×5/7 39×3/38 (1/2+1/7)×2×7
我没悬赏了、对不起哦 .
递等式解决 、、 谢谢了 !
请速度一点 . 谢谢 !
(5/6-5/9)×36 (24+1/5)×5/6 15/17×4/5×17/30
5/7×6/13+7/13×5/7 39×3/38 (1/2+1/7)×2×7
我没悬赏了、对不起哦 .
递等式解决 、、 谢谢了 !
请速度一点 . 谢谢 !
![用简便方法计算下面各题. 递等式计算、谢谢了!](/uploads/image/z/343266-42-6.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%E4%B8%8B%E9%9D%A2%E5%90%84%E9%A2%98.+%E9%80%92%E7%AD%89%E5%BC%8F%E8%AE%A1%E7%AE%97%E3%80%81%E8%B0%A2%E8%B0%A2%E4%BA%86%21)
(5/6-5/9)×36 =5/6*36-5/9*36=30-20=10
(24+1/5)×5/6
=24*5/6+1/5*5/6
=20+1/6
=20又1/6
15/17×4/5×17/30
=15*4*17/17*5*30
=4/10
=2/5
5/7×6/13+7/13×5/7
=5/7*(6/13+7/13)
=5/7*1
=5/7
39×3/38
=(38+1)*3/38
=3+3/38
=3又3/38
(1/2+1/7)×2×7
=1/2*2*7+1/7*2*7
=7+2
=9
(24+1/5)×5/6
=24*5/6+1/5*5/6
=20+1/6
=20又1/6
15/17×4/5×17/30
=15*4*17/17*5*30
=4/10
=2/5
5/7×6/13+7/13×5/7
=5/7*(6/13+7/13)
=5/7*1
=5/7
39×3/38
=(38+1)*3/38
=3+3/38
=3又3/38
(1/2+1/7)×2×7
=1/2*2*7+1/7*2*7
=7+2
=9