Nguyễn Thảo Vân
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2024-11-03 19:45:51
bài 1:
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.(\(-\dfrac{3}{2}\))\(^2\)-\(\dfrac{7}{2}\)
=2.\(\dfrac{9}{4}\)-\(\dfrac{7}{2}\)
=\(\dfrac{9}{2}\)-\(\dfrac{7}{2}\)
=1
c,\(-\dfrac{3}{4}\).5\(\dfrac{3}{13}\) -0,75.\(\dfrac{36}{13}\)
=\(-\dfrac{3}{4}\).\(\dfrac{68}{13}\)-\(-\dfrac{3}{4}\).\(\dfrac{36}{13}\)
=\(\dfrac{3}{4}\).(\(\dfrac{68}{13}\)-\(\dfrac{36}{13}\))
=\(\dfrac{3}{4}\).\(\dfrac{32}{13}\)
=\(\dfrac{24}{13}\)