题目内容

怎样简便就怎样算.
49.5×0.2+2.07÷23
1350+450÷15×25
7
9
÷
11
5
+
2
9
×
5
11
(0.75-
3
16
)×(
2
9
+
1
3
1
4
÷(3-
5
13
-
8
13
[4-(
3
4
-
3
8
)]×
4
29
(1)49.5×0.2+2.07÷23,
=9.9+0.09,
=9.99;

(2)1350+450÷15×25,
=1350+30×25,
=1350+750,
=2100;

(3)
7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=(
7
9
+
2
9
)×
5
11

=1×
5
11

=
5
11


(4)(0.75-
3
16
)×(
2
9
+
1
3
),
=(
3
4
-
3
16
)×(
2
9
+
3
9
),
=(
12
16
-
3
16
)×
5
9

=
9
16
×
5
9

=
5
16


(5)
1
4
÷(3-
5
13
-
8
13
),
=
1
4
÷[3-(
5
13
+
8
13
)],
=
1
4
÷[3-1],
=
1
4
÷2,
=
1
4
×
1
2

=
1
8


(6)[4-(
3
4
-
3
8
)]×
4
29

=[4-(
6
8
-
3
8
)]×
4
29

=[4-
3
8
4
29

=
29
8
×
4
29

=
1
2
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