题目内容

下面各题怎样算简便就怎样算.
①1.89+3.6+6.4+0.11
5
3
-
5
9
×
3
2
-
1
6

③1.2×99+1.2
④[
3
4
-(
4
5
-
3
10
)]×
8
11
①1.89+3.6+6.4+0.11,
=(1.89+0.11)+(3.6+6.4),
=2+10,
=12;

5
3
-
5
9
×
3
2
-
1
6

=
5
3
-
5
6
-
1
6

=
5
3
-(
5
6
+
1
6
),
=
5
3
-1,
=
2
3


③1.2×99+1.2,
=(99+1)×1.2,
=100×1.2,
=120;

④[
3
4
-(
4
5
-
3
10
)]×
8
11

=[
3
4
-(
8
10
-
3
10
)]×
8
11

=[
3
4
-
1
2
8
11

=
1
4
×
8
11

=
2
11
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