问题 解答题
简算:
12×(
2
3
-
1
4
+
1
6

8.5-(6
1
2
-3.875)
2.25×
15
4
-2.75×
9
4
+3×225%
答案

(1)12×(

2
3
-
1
4
+
1
6
),

=12×

2
3
-12×
1
4
+12×
1
6

=8-3+2,

=7;

(2)8.5-(6

1
2
-3.875),

=8.5-6

1
2
+3.875,

=8.5-6.5+3.875,

=2+3.875,

=5.875;

(3)2.25×

15
4
-2.75×
9
4
+3×225%,

=2.25×3.75-2.75×2.25+3×2.25,

=2.25×(3.75-2.75+3),

=2.25×4,

=9.

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