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)×5/615/17×4/5×17/305/7×6/13+7/13×5/739×3/38(1/2+1/7)×2×7我没悬赏了、对不起...
(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 !!!!!! 展开
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 !!!!!! 展开
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(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
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