Toán Lớp 8: $\dfrac{3x-2}{2xy}-\dfrac{7x-4}{2xy}$
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Toán Lớp 8: $\dfrac{3x-2}{2xy}-\dfrac{7x-4}{2xy}$
Comments ( 2 )
\frac{3x-2}{2xy}-\frac{7x-4}{2xy}
=\frac{(3x-2)-(7x-4)}{2xy}
=\frac{3x-2-7x+4}{2xy}
=\frac{(3x-7x)+(4-2)}{2xy}
=\frac{-4x+2}{2xy}
=\frac{2.(-2x+1)}{2.xy}
=\frac{1-2x}{xy}
\frac{3x-2}{2xy}-\frac{7x-4}{2xy}=\frac{3x-2-7x+4}{2xy}=\frac{2-4x}{2xy}=\frac{1-2x}{xy}