计算:(2√48-3√27)÷√6(√48+1/4√6)÷27用配方法:x^2-x-7/4=03x^2+6x-4=04x^2-6x-3=0用公式法:x^2+x-6=0x^2-√3x-1/4=03x^2-6x-2=04x^2-6x=0x^2+4x+8=4x+11x(2x-4)=5-8xx^2-75x+350=0用判别式
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