脱式计算下面各题(能简算的要用简便方法计算,并写出简算过程). 450÷18×25+173. 670+65÷

2024-12-15 17:06:55
推荐回答(1个)
回答1:

(1)450÷18×25+173,
=25×25+173,
=625+173,
=798;

(2)670+65÷3×

3
5

=670+65×(
1
3
×
3
5
),
=670+65×
1
5

=670+13,
=683;

(3)
5
8
-
1
6
×
4
5
+57,
=
5
8
-
2
15
+57,
=
59
120
+57,
=57
59
120


(4)38-12×6÷16,
=38-72÷16,
=38-4.5,
=33.5.