题目内容

计算下面各题.
657+360÷45×1921×
3
4
÷
4
5
×
8
21
28.6-(12.6+18.4)÷1.6
3
4
+
5
6
)÷
19
24
+
8
9

(1)657+360÷45×19,
=657+8×19,
=657+152,
=809;

(2)21×
3
4
÷
4
5
×
8
21

=21×
3
4
×
5
4
×
8
21

=(21×
8
21
)×(
3
4
×
5
4
),
=8×
15
16

=
15
2


(3)28.6-(12.6+18.4)÷1.6,
=28.6-31÷1.6,
=28.6-19.375,
=9.225;

(4)(
3
4
+
5
6
)÷
19
24
+
8
9

=
19
12
÷
19
24
+
8
9

=2+
8
9

=2
8
9
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