与x的取值无关,则含有x的项的系数都为03mx²—x²+6xy-4y-2(4x²+3xy+4)=3mx²—x²+6xy-4y-8x²-6xy-8=（3m-1-8）x²-4y-83m-1-8=0m=3m²-[m²+(3m-4)+m]=m²-（m²+3...