Giải phương trình sau:
$(3x+5)\sqrt{78y-39}+(3y+5)\sqrt{78x-39}=2(3x+5)(3y+5)$
$(3x+5)\sqrt{78y-39}+(3y+5)\sqrt{78x-39}=2(3x+5)(3y+5)$
Started By bachmahoangtu2003, 04-09-2015 - 20:10
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