题目内容

脱式计算,能简算的要简算.
(1)8.4×
1
10
+1.6÷10
(2)
3
7
÷
5
6
+
4
7
×
6
5
(3)(
1
17
+
1
4
)×4+
3
17
(4)12.5-(8.5+0.625÷62.5%)
(1)8.4×
1
10
+1.6÷10
=8.4×
1
10
+1.6×
1
10

=(8.4+1.6)×
1
10

=10×
1
10

=1;

(2)
3
7
÷
5
6
+
4
7
×
6
5

=
3
7
×
6
5
+
4
7
×
6
5

=(
3
7
+
4
7
)×
6
5

=1×
6
5

=
6
5


(3)(
1
17
+
1
4
)×4+
3
17

=
1
17
×4+
1
4
×4+
3
17

=
4
17
+
3
17
+1,
=1
7
17


(4)12.5-(8.5+0.625÷62.5%)
=12.5-(8.5+1),
=12.5-9.5,
=3.
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