若(x+y-5)²+根号下x-y+1=0,求-4x+3y的算术平方根

x��)�{ѽT�B�R�TSM����Z�ق�O��?��]�[�mhk��lc��I��q��Y-��M6g�ӝ��M� Th�T�O� �v6�pţ���&<��~OX��=��PU[���B ~�oz���N��1X������@:�|C[C���<;�{m���S6�\4�YK���K��5l��I͋勁niGr�.��_l� ��l!TW
���