若a=-(-5),丨b丨=4,则a-b=
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若a=-(-5),丨b丨=4,则a-b=
若a=-(-5),丨b丨=4,则a-b=
若a=-(-5),丨b丨=4,则a-b=
a=-(-5)=5
|b|=4,所以b=±4
所以,a-b=5-4=1,或者a-b=5+4=9
若a=-(-5),丨b丨=4,则a-b=1或-9
a = -(- 5)= 5
丨b丨= 4
∴ b = ± 4
① 当 b = 4 时,则 a - b = 5 - 4 = 1
② 当 b = - 4 时,则 a - b = 5 - (- 4)=9
由题目可知:
a=5,b=±4。
即有两种答案:
①a-b= 5-4 =1
②a-b = 5 +4 = 9
a=-(-5),丨b丨=4,
a=5 b= 4或 -4
则a-b= 5-4 =1
或者 a-b = 5 +4 = 9