题目内容

能简便的要简便.
①(
7
8
-
5
16
)×(
5
9
+
2
3
8
13
÷7+
1
7
×
6
13
③2
3
4
×
2
5
+
1
4
÷
5
2
1
6
÷[
9
17
×(
3
4
+
2
3
)]
12
13
×
3
7
+
4
7
×
12
13
+
12
13
⑥99×
99
100
⑦100×
98
99

①(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
1
2
×
11
9

=
11
18


8
13
÷7+
1
7
×
6
13

=
8
13
×
1
7
+
1
7
×
6
13

=(
8
13
+
6
13
)×
1
7

=
14
13
×
1
7

=
2
13


③2
3
4
×
2
5
+
1
4
÷
5
2

=2
3
4
×
2
5
+
1
4
×
2
5

=(2
3
4
+
1
4
)×
2
5

=3×
2
5

=
6
5


1
6
÷[
9
17
×(
3
4
+
2
3
)],
=
1
6
÷[
9
17
×
17
12
],
=
1
6
÷
3
4

=
2
9


12
13
×
3
7
+
4
7
×
12
13
+
12
13

=
12
13
×(
3
7
+
4
7
+1),
=
12
13
×2,
=
24
13


⑥99×
99
100

=(100-1)×
99
100

=100×
99
100
-1×
99
100

=99-
99
100

=98
1
100


⑦100×
98
99

=(99+1)×
98
99

=99×
98
99
+1×
98
99

=98+
98
99

=98
98
99
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