题目内容

脱式计算.(能简算的要简算)
7
9
+
11
+
4
9
+
19
11
4
9
-
4
9
÷4
7
8
÷
7
+
7
8
÷
7
4
7
÷[(
4
-
2
)÷
7
6
]
7
17
×(
4
21
+
8
17
÷
7
10
12-10÷7-
4
7
(1)
f
9
+
3
11
+
4
9
+
19
11

=(
f
9
+
4
9
)+(
3
11
+
19
11

=1+2
=3

(2)4÷
4
9
-
4
9
÷4
=9-
1
9

=c
c
9


(3)
f
c
÷
7
3
+
f
c
÷
7
4

=
f
c
×
3
7
+
f
c
×
4
7

=
f
c
×(
3
7
+
4
7

=
f
c
×1
=
f
c


(4)
3
f
÷[(
3
4
-
2
3
)÷
f
6
]
=
3
f
÷[
1
12
÷
f
6
]
=
3
f
÷
1
1c

=6

(f)
7
1f
×(
4
21
+
c
1f
÷
7
1c

=
7
1f
×(
4
21
+
16
21

=
7
1f
×
2c
21

=
4
9


(6)12-1c÷7-
4
7

=12-
1c
7
-
4
7

=12-(
1c
7
+
4
7

=12-2
=1c
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