(1)若a-(-b)=0,则|a-b|=___(2)若a0则|a-b|=___(3)若a=-5,b=-3,则|a-b|(4)若a=2,|b|=7,则a-b=___

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(1)若a-(-b)=0,则|a-b|=___(2)若a0则|a-b|=___(3)若a=-5,b=-3,则|a-b|(4)若a=2,|b|=7,则a-b=___
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(1)若a-(-b)=0,则|a-b|=___(2)若a0则|a-b|=___(3)若a=-5,b=-3,则|a-b|(4)若a=2,|b|=7,则a-b=___
(1)若a-(-b)=0,则|a-b|=___(2)若a0则|a-b|=___(3)若a=-5,b=-3,则|a-b|(4)若a=2,|b|=7,则a-b=___

(1)若a-(-b)=0,则|a-b|=___(2)若a0则|a-b|=___(3)若a=-5,b=-3,则|a-b|(4)若a=2,|b|=7,则a-b=___
lal+lbl
b-a
2
-5或9