Toán Lớp 8: ( 1- $\frac{2y}{x}$ + $\frac{y^{2} }{x^{2}}$ ) chia ( $\frac{1}{x}$ – $\frac{1}{y}$ )
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Toán Lớp 8: ( 1- $\frac{2y}{x}$ + $\frac{y^{2} }{x^{2}}$ ) chia ( $\frac{1}{x}$ – $\frac{1}{y}$ )
Comments ( 2 )
=(x^2-2xy+y^2)/x^2:\frac{y-x}{xy}
=(x-y)^2/x^2:\frac{y-x}{xy}
=(x-y)^2/x^2.\frac{xy}{ y-x}
=(y(y-x))/x
=(y^2-xy)/x