已知1<x<3,化简丨x-1丨/x-1+丨x-3丨/x-3
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1<x<3
x-1>0
x-3<0
丨x-1丨/(x-1)+丨x-3丨/(x-3)
=(x-1)/(x-1)+(3-x)/(x-3)
=(x-1)/(x-1)-(x-3)/(x-3)
=1-1
=0
x-1>0
x-3<0
丨x-1丨/(x-1)+丨x-3丨/(x-3)
=(x-1)/(x-1)+(3-x)/(x-3)
=(x-1)/(x-1)-(x-3)/(x-3)
=1-1
=0
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1<x<3
x-1>0, x-3<0
所以:|x-1|=x-1,|x-3|=-(x-3)
丨x-1丨/x-1+丨x-3丨/x-3
=(x-1)/(x-1)-(x-3)/(x-3)
=1-1
=0
x-1>0, x-3<0
所以:|x-1|=x-1,|x-3|=-(x-3)
丨x-1丨/x-1+丨x-3丨/x-3
=(x-1)/(x-1)-(x-3)/(x-3)
=1-1
=0
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明天评讲看下把~
追答
你太小瞧我了,好伤心!
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