题目内容
(2011?东莞模拟)
脱式计算
|
(1375+450÷18)×200 | ||||||||
0.4÷(2.4×4-36×0.25) | 3
|
分析:分数、小数的四则混合运算和整数的四则混合运算一致,先算乘除,后算加减,有括号的先算括号内的.
解答:解:
×
+
÷
,
=
+
,
=
;
(1375+450÷18)×200,
=(1375+25)×200
=280000;
0.4÷(2.4×4-36×0.25),
=0.4÷(9.6-9),
=0.4÷0.6,
=
;
3
-
×
-2
,
=3
-
-2
,
=3
-(
+2
),
=3
-3,
=
.
4 |
5 |
2 |
7 |
4 |
5 |
7 |
5 |
=
8 |
35 |
20 |
35 |
=
4 |
5 |
(1375+450÷18)×200,
=(1375+25)×200
=280000;
0.4÷(2.4×4-36×0.25),
=0.4÷(9.6-9),
=0.4÷0.6,
=
2 |
3 |
3
2 |
9 |
6 |
5 |
5 |
7 |
1 |
7 |
=3
2 |
9 |
6 |
7 |
1 |
7 |
=3
2 |
9 |
6 |
7 |
1 |
7 |
=3
2 |
9 |
=
2 |
9 |
点评:此题考查了整数、分数、小数的四则混合运算,灵活运用乘法结合律、加法交换律等运算定律可以使运算简便.
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