题目内容

下面各题,怎样算简便就怎样算:
(1)1.8+2.7+3.2+2.3
(2)
3
5
+9×
2
5

(3)1-
7
9
÷
7
8

(4)[1-(
1
4
+
3
8
)]÷
1
4
(1)1.8+2.7+3.2+2.3,
=(1.8+3.2)+(2.7+2.3),
=5+5,
=10;

(2)
3
5
+9×
2
5

=9×(
3
5
+
2
5
),
=9×1,
=9;

(3)1-
7
9
÷
7
8

=1-
7
9
×
8
7

=1-
8
9

=
1
9


(4)[1-(
1
4
+
3
8
)]÷
1
4

=[1-
5
8
]÷
1
4

=
3
8
÷
1
4

=
3
8
×
4,
=
3
2

=1
1
2
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