问题 解答题
下面各题怎样算简便就怎样算.
36×1990.54×1.75+8.25×0.542.5-
1
2
÷
4
7
-
1
16
÷
1
2
答案

(1)36×199,

=36×(200-1),

=36×200-36×1,

=7200-36,

=7164;

(2)0.54×1.75+8.25×0.54,

=0.54×(1.75+8.25),

=0.54×10,

=5.4;

(3)2.5-

1
2
÷
4
7
-
1
16
÷
1
2

=2.5-

7
8
-
1
8

=2.5-(

7
8
+
1
8
),

=2.5-1,

=1.5.

单项选择题
单项选择题