问题 解答题
脱式能简要简
1
5
÷[(
2
3
+
1
5
)×
1
13
]
1
13
-
1
13
×
1
2
+
1
13
÷2
98
99
×98
7
9
÷
11
5
+
2
9
×
5
11
+
5
11
÷
1
10
答案

(1)

1
5
÷[(
2
3
+
1
5
)×
1
13
]

=

1
5
÷[
13
15
×
1
13
],

=

1
5
÷
1
15

=3;

(3)

1
13
-
1
13
×
1
2
+
1
13
÷2

=

1
13
-
1
13
×
1
2
+
1
13
×
1
2

=(1-

1
2
+
1
2
)×
1
13

=1×

1
13

=

1
13

(3)

98
99
×98

=

98
99
×(99-1),

=

98
99
×99-
98
99
×1,

=98-

98
99

=97

1
99

(4)

7
9
÷
11
5
+
2
9
×
5
11
+
5
11
÷
1
10

=

7
9
×
5
11
+
2
9
×
5
11
+
5
11
×10,

=(

7
9
+
2
9
+10)×
5
11

=(1+10)×

5
11

=11×

5
11

=5.

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