通分①3/4x^2y,-5/6y^2z,1/2xz^2②1/x^2y^2,1/x^2+xy③3/2(x+3),x/x^2-9,1/6-2x
问题描述：
通分①3/4x^2y,-5/6y^2z,1/2xz^2②1/x^2y^2,1/x^2+xy③3/2(x+3),x/x^2-9,1/6-2x
答
①3/4x^2y,-5/6y^2z,1/2xz^2,最简公分母12x²y²z²3/4x^2y＝9yz²/﹙12x²y²z²﹚-5/6y^2z,＝﹣10x²z/﹙12x²y²z²﹚1/2xz^2＝6xy²/﹙12x²y²z²...