VŨ QUỐC HOÀN
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2024-10-22 21:59:26
a)\(\dfrac{2}{3}\).\(\dfrac{5}{4}\)-\(\dfrac{3}{4}\).\(\dfrac{2}{3}\)=\(\dfrac{2}{3}\).(\(\dfrac{5}{4}\)-\(\dfrac{3}{4}\))=\(\dfrac{2}{3}\).\(\dfrac{1}{2}\)=\(\dfrac{1}{3}\) b)2.\(\dfrac{\left(-3\right)^2}{\left(2\right)^2}\)-\(\dfrac{7}{2}\)=2.\(\dfrac{9}{4}\)-\(\dfrac{7}{2}\)=\(\dfrac{9}{2}\)-\(\dfrac{7}{2}\)=\(\dfrac{5}{2}\) c)\(-\dfrac{3}{4}\).5\(\dfrac{3}{13}\)-0,75.\(\dfrac{36}{13}\)=\(-\dfrac{3}{4}\).\(\dfrac{68}{13}\)-\(\dfrac{3}{4}\).\(\dfrac{36}{13}\)=-\(\dfrac{3}{4}\).(\(\dfrac{68}{13}-\dfrac{36}{13}\))=\(\dfrac{-3}{4}\).\(\dfrac{32}{13}\)=\(-\dfrac{24}{13}\)