题目内容

计算下面各题:
1
8
+(
7
8
-
5
12
);
4
1
3
-2.5+1
3
4
2
3
-
1
9
-
2
9
〔16.8-(1.6+3.8)〕÷1.9;9.8×100.1;8.4÷3.5.
(1)
1
8
+(
7
8
-
5
12
),
=(
1
8
+
7
8
)-
5
12

=1-
5
12

=
7
12


(2)4
1
3
-2.5+1
3
4

=4
1
3
-2
1
2
+1
3
4

=4
4
12
-2
6
12
+1
9
12

=3
7
12


(3)
2
3
-
1
9
-
2
9

=
2
3
-(
1
9
+
2
9
),
=
2
3
-
1
3

=
1
3


(4)[16.8-(1.6+3.8)]÷1.9,
=[16.8-5.4]÷1.9,
=11.4÷1.9,
=6;

(5)9.8×100.1,
=9.8×(100+0.1),
=980+0.98,
=980.98;

(6)8.4÷3.5=2.4.
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