à....................cái đấy mình vẫn đang nghĩ

\(A=\frac{1}{3}-\frac{3}{4}-\left(\frac{-3}{5}\right)+\frac{1}{15}-\frac{2}{9}-\frac{1}{36}\)

\(\Rightarrow A=\frac{5}{15}-\frac{27}{36}+\frac{9}{15}+\frac{1}{15}-\frac{8}{36}-\frac{1}{36}\)

\(\Rightarrow A=\left(\frac{5}{15}+\frac{9}{15}+\frac{1}{15}\right)-\left(\frac{27}{36}+\frac{8}{36}+\frac{1}{36}\right)\)

\(\Rightarrow A=1-1=2\)

\(\left(\frac{5}{7}-\left|\frac{-7}{5}\right|\right)-\left[\left|\frac{-1}{2}\right|-\left(-\frac{2}{7}+\left|\frac{-1}{10}\right|\right)\right]\)

\(=\left(\frac{5}{7}-\frac{7}{5}\right)-\left[\frac{1}{2}-\left(-\frac{2}{7}+\frac{1}{10}\right)\right]\)

\(=\frac{5}{7}-\frac{7}{5}-\left(\frac{1}{2}+\frac{2}{7}-\frac{1}{10}\right)\)

\(=\frac{5}{7}-\frac{7}{5}-\frac{1}{2}-\frac{2}{7}+\frac{1}{10}\)

\(=\left(\frac{5}{7}-\frac{2}{7}\right)-\left(\frac{7}{5}+\frac{1}{2}-\frac{1}{10}\right)\)

\(=\frac{3}{7}-\frac{9}{5}=\frac{-48}{35}\)

\(\left(-\frac{1}{3}\right)-\left(-\frac{3}{5}\right)^0+\left(1-\frac{1}{2}\right)^2\div2.\)

\(=\left(-\frac{1}{3}\right)-1+\left(\frac{1}{2}\right)^2\div2\)

\(=-\frac{4}{3}+\frac{1}{4}\div2\)

\(=-\frac{4}{3}+\frac{1}{8}=-\frac{29}{24}\)

\(B=\frac{3x+4}{x-3}\inℤ\left(x\ne3\right)\)

\(\Rightarrow3x+4⋮x-3\)

\(\Rightarrow3x-9+13⋮x-3\)

\(\Rightarrow3\left(x-3\right)+13⋮x-3\)

Ta có: \(3\left(x-3\right)⋮x-3\)

\(\Rightarrow13⋮x-3\)

\(\Rightarrow x-3\inƯ\left(13\right)=\left\{\pm1;\pm13\right\}\Rightarrow x\in\left\{4;2;16;-10\right\}\)

\(25\times\left(-\frac{1}{3}\right)^3+\frac{1}{5}-2\times\left(-\frac{1}{2}\right)^2-\left|-\frac{1}{2}\right|.\)

\(=25\times\left(-\frac{1}{27}\right)+\frac{1}{5}-2\times\frac{1}{4}-\frac{1}{2}\)

\(=-\frac{25}{27}+\frac{1}{5}-\frac{1}{2}-\frac{1}{2}\)

\(=-\frac{98}{135}-\frac{1}{2}-\frac{1}{2}\)

\(=-\frac{331}{270}-\frac{1}{2}==-\frac{233}{135}\)

cảm ơn bạn vì đã giúp tôi

145:3  rồi lấy kết quả đó nhân 15

145 ko chia được cho 3 bạn nhé

QUANDA MÀ CHÉP  BN :p

Hộ nè :

\(5\sqrt{16}-4\sqrt{9}+\sqrt{25}-0,3\sqrt{400}\)

\(=5.4-4.3+5-0,3.20\)

\(=20-12+5-6=7\)

có ai ko huhu

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