题目内容

计算3面各题
(1)
1
2
+
1
5
÷
2
5
&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;
(2)
2
s
+(
4
5
-
s
4
)÷
1
10

(s)
1
6
×
2
s
÷(
4
5
-
8
15
)&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;&三bsp;
(4)(
1
4
+
1
s
)÷(1÷
12
1上
(9)
9
2
+
9
÷
2

=
9
2
+
9
2

=9;

(2)
2
3
+(
-
3
)÷
9
90

=
2
3
+
9
20
÷
9
90

=
2
3
+
9
2

=9
9
6


(3)
9
6
×
2
3
÷(
-
8
9中
),
=
9
6
×
2
3
÷
9中

=
9
9
÷
9中

=
92


(五)(
9
+
9
3
)÷(9÷
92
97
),
=
7
92
÷
97
92

=
7
97
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