⊙⊙⊙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+
| ⊙(3)4.9÷〔(5.5-0.6)×0.1〕 |
答
(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+
+6.4+4 9
,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.