题目内容

怎样简便就怎样算.
7
12
×
6
7
+
3
4
11-
5
17
×
4
5
99×
87
100
4
25
×34+
4
25
×16
(2-
1
4
)÷
1
12
5
4
÷〔1÷(
1
5
-
1
10
)〕
(1)
7
12
×
6
7
+
3
4

=
1
2
+
3
4

=
5
4


(2)11-
5
17
×
4
5

=11-
4
17

=10
13
17


(3)99×
87
100

=(100-1)×
87
100

=100×
87
100
-
87
100

=87-
87
100

=86
13
100


(4)
4
25
×34+
4
25
×16
=
4
25
×(34+16)
=
4
25
×50
=8;

(5)(2-
1
4
)÷
1
12

=(2-
1
4
)×12
=2×12-
1
4
×12
=24-3
=21;

(6)
5
4
÷[1÷(
1
5
-
1
10
)]
=
5
4
÷[1÷
1
10
]
=
5
4
÷10
=
5
4
×
1
10

=
1
8
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