数学
跪求!六年级数学题简便运算(1)1/5÷3+1/3×4/5(2)19/33×6/7-6/7×5/13(3)(7/8-5/6)÷14/33应用题(1)要做10个直径为50厘米的铁圈,需要铁丝多少米?

2019-05-05

跪求!六年级数学题
简便运算
(1)1/5÷3+1/3×4/5
(2)19/33×6/7-6/7×5/13
(3)(7/8-5/6)÷14/33
应用题
(1)要做10个直径为50厘米的铁圈,需要铁丝多少米?
优质解答
(1)1/5÷3+1/3×4/5
=1/5×1/3+1/3×4/5
=1/15+4/15
=5/15
=1/3
(2)19/33×6/7-6/7×5/13
= (19×6)/(33×7)-(5×6)/(13×7)
=114/231-30/91通分算结果即可.
(3)
(7/8-5/6)÷14/33
=7/8×33/14-5/6×33/14
=33/16-165/84
通分算结果即可.
应用:10×π×0.5=5π米
(1)1/5÷3+1/3×4/5
=1/5×1/3+1/3×4/5
=1/15+4/15
=5/15
=1/3
(2)19/33×6/7-6/7×5/13
= (19×6)/(33×7)-(5×6)/(13×7)
=114/231-30/91通分算结果即可.
(3)
(7/8-5/6)÷14/33
=7/8×33/14-5/6×33/14
=33/16-165/84
通分算结果即可.
应用:10×π×0.5=5π米
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