问题 解答题
计算:
(1)(
1
4
×
6
5
+
1
2
)÷
4
5
(2)2÷[(
1
2
+
1
3
)×
2
5
]
(3)40%x+16=80.
答案

(1)(

1
4
×
6
5
+
1
2
)÷
4
5

=(

3
10
+
1
2
)÷
4
5

=

4
5
×
5
4

=1;

(2)2÷[(

1
2
+
1
3
)×
2
5
]

=2÷[

5
6
×
2
5
]

=2÷

1
3

=2×3

=6;

(3)40%x+16=80

40%x+16-16=80-16

40%x÷40%=64÷40%

x=160.

单项选择题 A1型题
判断题