问题 解答题
脱式计算.(能简算的要简算)
0.375×1
3
4
+
5
8
×1.75
1
4
+
5
6
+
2
3
)×12
1
1
5
×12.5×8
3.14÷5+3.14×
4
5
7
20
+(9
1
4
-7
3
5
)÷2
3
4
4
1
5
-1.65-1.35.
答案

(1)0.375×1

3
4
+
5
8
×1.75,

=

3
8
×1
3
4
+
5
8
×1
3
4

=(

3
8
+
5
8
)×1
3
4

=1×1

3
4

=1

3
4

(2)(

1
4
+
5
6
+
2
3
)×12,

=

1
4
×12+
5
6
×12+
2
3
×12,

=3+10+8,

=21.

(3)1

1
5
×12.5×8,

=

6
5
×(12.5×8),

=

6
5
×100,

=120.

(4)3.14÷5+3.14×

4
5

=3.14×

1
5
+3.14×
4
5

=3.14×(

1
5
+
4
5
),

=3.14×1,

=3.14.

(5)

7
20
+(9
1
4
-7
3
5
)÷2
3
4

=

7
20
+(
37
4
-
38
5
)÷
11
4

=

7
20
+(
185
20
-
152
20
)÷
11
4

=

7
20
+
33
20
×
4
11

=

7
20
+
12
20

=

19
20

(6)4

1
5
-1.65-1.35,

=4

1
5
-(1.65+1.35),

=4

1
5
-3,

=1

1
5

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