题目内容

(4.5×1.1×4.8)÷(3.3×0.8×0.5)12.5×2.5×0.8×4.6.3×
3
4
+3.7÷
4
3
7÷(7-7×0÷7+7÷7)18×45×(
5
6
+
1
5
2.25×
15
4
-2.75×
9
4
+3×225%
(1)(4.5×1.1×4.8)÷(3.3×0.8×0.5),
=(4.5÷0.5)×(4.8÷0.8)×(1.1÷3.3),
=9×6×1.1÷3.3,
=9×(6×1.1÷3.3),
=9×(6.6÷3.3),
=9×2,
=18;

(2)12.5×2.5×0.8×4,
=(12.5×0.8)×(2.5×4),
=10×10,
=100;

(3)6.3×
3
4
+3.7÷
4
3

=6.3×0.75+3.7×0.75,
=(6.3+3.7)×0.75,
=10×0.75,
=7.5;

(4)7÷(7-7×0÷7+7÷7),
=7÷(7-0+1),
=7÷8,
=
7
8


(5)18×45×(
5
6
+
1
5
),
=(18×45)×(
5
6
+
1
5
),
=(18×45)×
5
6
+(18×45)×
1
5

=15×45+18×9,
=675+162,
=837;

(6)2.25×
15
4
-2.75×
9
4
+3×225%,
=2.25×
15
4
-
11
4
×2.25+3×2.25,
=2.25×(
15
4
-
11
4
+3),
=2.25×(1+3),
=2.25×4,
=9.
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