1+
5
6
=
2-
1
2
=
4
7
-
3
28
=
1.2×0.01=
9
8
-
4
7
-
3
7
=
1
2
÷
2
5
=
2
3
=
2
3
×
3
8
=
5
6
÷6=
3÷4+
1
4
=
分析:根據(jù)分?jǐn)?shù)的加減乘除與小數(shù)的乘法進(jìn)行計算即可;
9
8
-
4
7
-
3
7
=
9
8
-(
4
7
+
3
7
)可以進(jìn)行簡算.
解答:解:
1+
5
6
=1
5
6
2-
1
2
=1
1
2
,
4
7
-
3
28
=
13
28
1.2×0.01=0.012,
9
8
-
4
7
-
3
7
=
1
8
,
1
2
÷
2
5
=
5
4
2
3
=4,
2
3
×
3
8
=
1
4
,
5
6
÷6=
5
36
,
3÷4+
1
4
=1.
點評:口算時,看清數(shù)據(jù)和運(yùn)算符號再進(jìn)行計算,能簡算的要簡算.
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