明天就要上学了
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/07/14 23:59:44
明天就要上学了
![](http://img.wesiedu.com/upload/9/28/928e635ebd6020bf18c71061039ac420.jpg)
![](http://img.wesiedu.com/upload/9/28/928e635ebd6020bf18c71061039ac420.jpg)
![明天就要上学了](/uploads/image/z/17429492-20-2.jpg?t=%E6%98%8E%E5%A4%A9%E5%B0%B1%E8%A6%81%E4%B8%8A%E5%AD%A6%E4%BA%86%26nbsp%3B)
25.
=99*[(1/99)-100]
=99*(1/99)-99*100
=1-9900
= - 9899
26.
= -4 -[3+(4/5)*(-5/2)+2]
= -4 -[3-2+2]
= -4-3
= - 7
27.
3x-2x=6+1
x=7
28.
-4x+(5/2)x=8+1
-(3/2)x=9
x= -9*(2/3)
x= - 6
29.
5x+2x=(1/2)-1-1
7x= - 3/2
x= - 3/14
30.
-4x+(5/2)x=8+1
-(3/2)x=9
x= - 9*(2/3)
x= - 6
=99*[(1/99)-100]
=99*(1/99)-99*100
=1-9900
= - 9899
26.
= -4 -[3+(4/5)*(-5/2)+2]
= -4 -[3-2+2]
= -4-3
= - 7
27.
3x-2x=6+1
x=7
28.
-4x+(5/2)x=8+1
-(3/2)x=9
x= -9*(2/3)
x= - 6
29.
5x+2x=(1/2)-1-1
7x= - 3/2
x= - 3/14
30.
-4x+(5/2)x=8+1
-(3/2)x=9
x= - 9*(2/3)
x= - 6