几道数学题,快,半小时之内答完4x-y-3z=0 x-3y+z=0 x比y比z=( )(m+n)x+(2m-3n)3|x-1|-|x+1|=2|x+2| x=( )2(-1\2-k)x-3x=-1有唯一解k=( )1到2005的平方是指1方,2方,2005方

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