18÷﹙3.2-1.7﹚-1.5 、4/5-﹙4/5+1/4﹚÷3、5/9+8/15÷3/10-1/6。 简便计算 5
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18÷﹙3.2-1.7﹚-1.5
=18÷1.5 - 1.5
=18÷(3/2) - 1.5
=18×(2/3) - 1.5
=12 - 1.5
=10.5
4/5-﹙4/5+1/4﹚÷3
=4/5-﹙16/20 + 5/20﹚×(1/3)
=4/5-﹙21/20﹚×(1/3)
=16/20 - 7/20
=9/20
5/9+8/15÷3/10-1/6
=5/9+ 8/15×(10/3)-1/6
=5/9+ 16/9-1/6
=21/9 - 1/6
=7/3 - 1/6
=14/6 - 1/6
=13/6
=2又1/6
=18÷1.5 - 1.5
=18÷(3/2) - 1.5
=18×(2/3) - 1.5
=12 - 1.5
=10.5
4/5-﹙4/5+1/4﹚÷3
=4/5-﹙16/20 + 5/20﹚×(1/3)
=4/5-﹙21/20﹚×(1/3)
=16/20 - 7/20
=9/20
5/9+8/15÷3/10-1/6
=5/9+ 8/15×(10/3)-1/6
=5/9+ 16/9-1/6
=21/9 - 1/6
=7/3 - 1/6
=14/6 - 1/6
=13/6
=2又1/6
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