题目内容

计算:①27﹣13+(﹣4)﹣25      
②0.25+(﹣)﹣﹣|﹣|

④﹣23+[18﹣(﹣3)×2]÷4
⑤﹣71×16                    

解:①27﹣13+(﹣4)﹣25
=27﹣13﹣4﹣25
=﹣15;
②0.25+(﹣)﹣﹣|﹣|
=
=
=﹣1


=×(﹣)﹣×(﹣)﹣×(﹣
=﹣2+1
=﹣
④﹣23+[18﹣(﹣3)×2]÷4
=﹣8+[18+6]×
=﹣8+24×
=﹣8+6
=﹣2;
⑤﹣71×16
=(﹣71﹣)×16
=(﹣71)×16﹣×16
=﹣1136﹣15
=﹣1151;

=﹣1××(﹣)+
=

练习册系列答案
相关题目
(1)计算:(
27
+
1
3
)-(
12
-
1
5
+
45
)

(2)已知:(x-15)2=169,(y-1)3=-0.125,求
-
2xy 
-
32y-x
的值.
(2013•燕山区一模)计算:
27
-(
1
3
)-1-2cos30°+(π-3)0
计算:
27
-
1
3
+
12

②计算:-12+(-2)3×
1
8
-
3-27
×(-
1
9
)
计算:
①27-13+(-4)-25       
②0.25+(-
1
8
)-
3
4
-|-
7
8
|
(1
3
4
-
7
8
-
7
12
)×(-
8
7
)

④-23+[18-(-3)×2]÷4
⑤-71
15
16
×16                    
-14÷(-5)2×(-
5
3
)+|0.8-1|
(1)计算:(
27
+
1
3
)-(
12
-
1
5
+
45
)
-(
12
-
1
5
+
45

(2)先化简然后选择一个你喜欢的x的值代入求值
x2-4
x2-4x4
÷
x-2
x+1
-
x
x-2