⊙⊙⊙脱式计算.(能简便的要用简便方法) (1)101×26-520÷4 ⊙(2)3.6+4/9+6.4+5/9 ⊙(3)4.9÷〔(5.5-0.6)×0.1〕

问题描述:

⊙⊙⊙⊙⊙
脱式计算.(能简便的要用简便方法)
(1)101×26-520÷4             
(2)3.6+
4
9
+6.4+
5
9
             
(3)4.9÷〔(5.5-0.6)×0.1〕

(1)101×26-520÷4,
=(100+1)×26-520÷4,
=100×26+1×26-520÷4,
=2600+26-520÷4,
=2600+26-130,
=2626-130,
=2496;
(2)3.6+

4
9
+6.4+
5
9

=(3.6+6.4)+(
4
9
+
5
9
),
=10+1,
=11;
(3)4.9÷[(5.5-0.6)×0.1],
=4.9÷[4.9×0.1],
=4.9÷0.49,
=10.