问题 解答题
计算:
(1)-8+4÷(-2);
(2)(-42)×(
1
6
-
3
14
+
2
7
)

(3)
15
-
36
(结果精确到0.1);
(4)(-2)2-15×
81
答案

(1)-8+4÷(-2)

=-8+(-2)

=-10;

(2)(-42)×(

1
6
-
3
14
+
2
7
)

=-42×

1
6
+42×
3
14
-42×
2
7

=-7+9-12

=2-12

=-10;

(3)

15
-
36

≈3.87-1.82

=2.05

≈2.1;

(4)(-2)2-15×

81

=4-1×9

=4-9

=-5.

单项选择题 A1/A2型题
多项选择题