直接寫得數(shù):13.75-7.5= 600÷15= 6.4×1.25= 0.1-0.1+0.1=
0.1÷0.1×0.1= 4.89×0.2×0.5= 0.25×4÷0.25×4= (1.01-0.91)×5=
36×0.7×2.5=
1
2
+
1
3
=
1
4
+1
1
3
=
5
6
-
1
2
=
1
1
2
×
2
3
=
5
7
×10
=
3
4
÷75%
=
2
1
3
×
6
7
=
4÷4
4
5
=
1
1
2
-1
1
2
÷1
1
2
=
0.6×
2
5
=
1-
1
4
-0.75
=
1
2
+
1
2
-
1
2
×
1
2
=
7×50%÷1×50%+0= 1.25÷1
1
4
×5%
=
1
4
+
1
4
×4
=
3
7
+0.67+1
4
7
=
4
5
17
-(3
5
17
+0.73)
=
(
1
2
+
1
3
+
1
6
)×6
=
(
1
4
-0.25)÷(7
1
13
-2
17
19
)
=
分析:根據(jù)小數(shù)、整數(shù)、分數(shù)和百分數(shù)加減乘除的計算方法進行計算;
0.1-0.1+0.1、0.1÷0.1×0.1、0.25×4÷0.25×4、7×50%÷1×50%+0、1.25÷1
1
4
×5%
按照從左向右的順序進行計算;
4.89×0.2×0.5、36×0.7×2.5根據(jù)乘法交換律和結合律進行簡算;
1-
1
4
-0.75
4
5
17
-(3
5
17
+0.73)
根據(jù)連減的性質進行簡算;
3
7
+0.67+1
4
7
根據(jù)加法交換律進行簡算;
(
1
2
+
1
3
+
1
6
)×6
根據(jù)乘法分配律進行簡算.
解答:解:
13.75-7.5=6.25 600÷15=40 6.4×1.25=8 0.1-0.1+0.1=0.1
0.1÷0.1×0.1=0.1 4.89×0.2×0.5=0.489 0.25×4÷0.25×4=16 (1.01-0.91)×5=0.5
36×0.7×2.5=63
1
2
+
1
3
=
5
6
1
4
+1
1
3
=1
7
12
5
6
-
1
2
=
1
3
1
1
2
×
2
3
=1
5
7
×10
=
50
7
3
4
÷75%
=1
2
1
3
×
6
7
=2
4÷4
4
5
=
5
6
1
1
2
-1
1
2
÷1
1
2
=
1
2
0.6×
2
5
=0.24
1-
1
4
-0.75
=0
1
2
+
1
2
-
1
2
×
1
2
=
3
4
7×50%÷1×50%+0=1.75 1.25÷1
1
4
×5%
=0.05
1
4
+
1
4
×4
=17
3
7
+0.67+1
4
7
=2.67
4
5
17
-(3
5
17
+0.73)
=0.27
(
1
2
+
1
3
+
1
6
)×6
=6
(
1
4
-0.25)÷(7
1
13
-2
17
19
)
=0
點評:口算時,注意運算符號和數(shù)據(jù),然后再進一步計算.
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