Bài 1:Tính bằng cách hợp lý nhất:A)\(\frac{2181.729+243.81.27}{3^2.9^2.234+18.54.162.9+729.732}\) B)\(\frac{1}{1.2}\)+\(\frac{1}{2.3}\)+\(\frac{1}{3.4}\)+....+\(\frac{1}{99.100}\)C)\(\frac{-1}{20}\)+\(\frac{-1}{30}\)+\(\frac{-1}{42}\)+\(\frac{-1}{56}\)+\(\frac{-1}{72}\)+\(\frac{-1}{90}\)Bài 2: Tìm số nguyên x,biết:A)\(\frac{2}{3}\).x - \(\frac{3}{2}\).x=\(\frac{5}{12}\) B)\(\frac{7}{9}\):( 2+\(\frac{3}{4}\).x) + \(\frac{23}{27}\)Giúp mik nha...
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Bài 1:Tính bằng cách hợp lý nhất:
A)\(\frac{2181.729+243.81.27}{3^2.9^2.234+18.54.162.9+729.732}\) B)\(\frac{1}{1.2}\)+\(\frac{1}{2.3}\)+\(\frac{1}{3.4}\)+....+\(\frac{1}{99.100}\)
C)\(\frac{-1}{20}\)+\(\frac{-1}{30}\)+\(\frac{-1}{42}\)+\(\frac{-1}{56}\)+\(\frac{-1}{72}\)+\(\frac{-1}{90}\)
Bài 2: Tìm số nguyên x,biết:
A)\(\frac{2}{3}\).x - \(\frac{3}{2}\).x=\(\frac{5}{12}\) B)\(\frac{7}{9}\):( 2+\(\frac{3}{4}\).x) + \(\frac{23}{27}\)
Giúp mik nha :)
