a的绝对值是2分之1,b的绝对值是3分之一,求a-b等于几
问题描述：
a的绝对值是2分之1,b的绝对值是3分之一,求a-b等于几
答
是6分之1
答
当a>0 b>0 时 a-b=1/2 -1/3 = 1/6
当a>0 b当a0 时 a-b=-1/2 -1/3 = -5/6
当a>
答
|a| = 1/2,a = 1/2,a = -1/2
|b| = 1/3,b = 1/3,a = -1/3
1.a = 1/2,b = 1/3,a - b = 1/2 - 1/3 = 1/6
2.a = -1/2,b = 1/3,a -b = -1/2 - 1/3 = -5/6
3.a = 1/2,b = -1/3,a - b = 1/2 + 1/3 = 5/6
4.a = -1/2,b = -1/3,a - b = -1/2 + 1/3 = -1/6
答
a=1/2, a=-1/2
b=1/3, b=-1/3
a-b=1/6, 5/6, -5/6 , -1/6