题目内容

0.7+0.7+…+0.7
80个0.7相加
×1.28
5-(
6
7
÷
3
14
+
6
13
)
2.8×
3
4
+0.75×6.2+
3
4
 
4
15
×
1
2
÷(
3
5
+
1
4
)
(1)
0.7+0.7+…+0.7
80个0.7相加
×1.28
=0.7×80×1.28,
=56×1.28,
=71.68;

(2)5-(
6
7
÷
3
14
+
6
13
)

=5-(4+
3
16
),
=5-4
3
16

=
13
16


(3)2.8×
3
4
+0.75×6.2+
3
4
 
=2.8×0.75+0.75×6.2+0.75,
=(2.8+6.2+1)×0.75,
=10×0.75,
=7.5;

(4)
4
15
×
1
2
÷(
3
5
+
1
4
)

=
2
15
÷
17
20

=
8
51
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