题目内容

计算题
(9.18×
1
3
-2
1
2
11
15
7.8÷[32×(1-
5
8
)+3.6]
1-(+4)-(-
1
3
)+(-2
1
2
)
6.5×8+4
1
2
×8-8
12×(
1
4
+
1
6
-
1
3
)
⑥78+209+122+491-258-42.
①(9.18×
1
3
-2
1
2
)÷
11
15

=(3.06-2.5)÷
11
15

=0.56×
15
11

=
14
25
×
15
11

=
42
55


7.8÷[32×(1-
5
8
)+3.6]

=7.8÷[32-32×
5
8
+3.6],
=7.8÷[32-20+3.6],
=7.8÷15.6,
=0.5;

1-(+4)-(-
1
3
)+(-2
1
2
)

=-3+
1
3
-2
1
2

=-
8
3
-
5
2

=-5
1
6


6.5×8+4
1
2
×8-8

=6.5×8+4
1
2
×8-8
×1,
=(6.5+4
1
2
-1)×8,
=10×8,
=80;

12×(
1
4
+
1
6
-
1
3
)

=12×
1
4
+12×
1
6
-12×
1
3

=3+2-4,
=5-4,
=1;

⑥78+209+122+491-258-42
=(78+122)+(209+491)-(258+42)
=200+700-300,
=900-300,
=600.
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