题目内容

脱式计算,能简算的要简算.
475+660÷33×25 400-14
13
27
-85
14
27
(
5
9
+
7
8
-
11
12
)×36
5.84×1.36+1.36×3.16+1.36
[1.9-6÷(2.4×5)]÷(14×0.2) [(
8
9
+
4
3
3
4
-
1
4
1
12
分析:按四则运算顺序解答
解答:解:475+660÷33×25
=475+20×25
=475+500
=975;
 (
5
9
+
7
8
-
11
12
)×36
=
5
9
×36+
7
8
×36-
11
12
×36
=20+
63
2
-33
=18.5
[1.9-6÷(2.4×5)]÷(14×0.2)
=[1.9-6÷12]÷2.8
=[1.9-0.5]÷2.8
=1.4÷2.8
=0.5
400-14
13
27
-85
14
27

=400-(14
13
27
+85
14
27

=400-100
=300;
5.84×1.36+1.36×3.16+1.36
=1.36×(5.84+3.16+1)
=1.36×10
=13.6;
[(
8
9
+
4
3
3
4
-
1
4
1
12

=[(
8
9
+
4
3
3
4
-
1
4
]×12

=[
8
9
×
3
4
+
4
3
×
3
4
-
1
4
]×12
=[
2
3
+1-
1
4
]×12
=
2
3
×12+1×12-
1
4
×12
=8+12-3
=17.
点评:按四则运算法则解题,能用规律简算的可以简算.
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