问题 解答题
选择合适的方法,计算下面各题.
18.7-4.375-6.625920÷40﹢23×50
12×(
1
4
+
1
6
-
1
3
4.4×
3
4
+3.6÷1
1
3
+0.75×2
答案

(1)18.7-4.375-6.625,

=18.7-(4.375+6.625),

=18.7-11,

=7.7;

(2)920÷40﹢23×50,

=23+23×50,

=23+1150,

=1173;

(3)12×(

1
4
+
1
6
-
1
3
),

=12×

1
4
+12×
1
6
-12×
1
3

=3+2-4,

=1;

(4)4.4×

3
4
+3.6÷1
1
3
+0.75×2,

=4.4×

3
4
+3.6×
3
4
+
3
4
×2,

=

3
4
×(4.4+3.6+2),

=

3
4
×10,

=

15
2

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