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a: \(A=\left(0+1\right):\left(\dfrac{2}{3}+\dfrac{7}{6}-\dfrac{1}{6}\right)=1:\dfrac{5}{3}=\dfrac{3}{5}\)
b: \(B=\left[0.8\cdot15\right]\cdot\left[1.25\cdot\dfrac{19}{3}\right]+31.64=15\cdot\dfrac{95}{12}+31.64=150.39\)
a: \(A=\dfrac{1}{9}:\dfrac{1}{9}:\left(\dfrac{10+7}{15}:\dfrac{12-5}{30}\right)\)
\(=1:\left(\dfrac{17}{15}\cdot\dfrac{30}{7}\right)=1:\dfrac{34}{7}=\dfrac{7}{34}\)
b: \(=\left(5.6+0.64\right)\cdot1.25\cdot\dfrac{19}{3}+31.64\)
\(=\dfrac{39}{5}\cdot\dfrac{19}{3}+\dfrac{791}{25}=\dfrac{2026}{25}\)
Bài 1:
A = \(\frac15\) + \(\frac{3}{17}\) - \(\frac43\) + (\(\frac45\) - \(\frac{3}{17}\) + \(\frac13\)) - \(\frac17\) + (- \(\frac{14}{30}\))
A = \(\frac15\) + \(\frac{3}{17}\) - \(\frac43\) + \(\frac45\) - \(\frac{3}{17}\) + \(\frac13\) - \(\frac17\) - \(\frac{14}{30}\)
A = (\(\frac15\) + \(\frac45\)) + (\(\frac{3}{17}\) - \(\frac{3}{17}\)) - (\(\frac43-\frac13\)) - \(\frac{30}{210}\) - \(\frac{98}{210}\)
A = 1 + 0 - 1 - (\(\frac{30}{210}+\frac{98}{210}\))
A = 1 - 1 - \(\frac{228}{210}\)
A = 0 - \(\frac{128}{210}\)
A = - \(\frac{64}{105}\)
Bài 2:
B= (\(\frac58\) - \(\frac{4}{12}\) + \(\frac32\)) - (\(\frac58\) + \(\frac{9}{13}\)) - (\(\frac{-3}{2}\)) + \(\frac{7}{-15}\)
B = \(\frac58\) - \(\frac{4}{12}\) + \(\frac32\) - \(\frac58\) - \(\frac{9}{13}\) + \(\frac32\) - \(\frac{7}{15}\)
B = (\(\frac58\) - \(\frac58\)) + (\(\frac32\) + \(\frac32\)) - (\(\frac13\) + \(\frac{9}{13}\) + \(\frac{7}{15}\))
B = 0 + 3 - (\(\frac{65}{195}\) + \(\frac{135}{195}\) + \(\frac{91}{195}\))
B = 3 - (\(\frac{200}{195}\) + \(\frac{91}{195}\))
B = 3 - \(\frac{97}{65}\)
B = \(\frac{195}{65}\) - \(\frac{97}{65}\)
B = \(\frac{98}{65}\)
\(A=\left(\frac{1}{4}-\frac{\frac{1}{4}+\frac{1}{9}}{\frac{1}{9}}\right):\left(\frac{2}{3}+\frac{\frac{7}{15}}{\frac{2}{5}-\frac{1}{6}}\right)\)
\(A=\left(\frac{1}{4}-\frac{\frac{9}{36}+\frac{4}{36}}{\frac{1}{9}}\right):\left(\frac{2}{3}+\frac{\frac{7}{15}}{\frac{12}{30}-\frac{5}{30}}\right)\)
\(A=\left(\frac{1}{4}-\frac{\frac{13}{36}}{\frac{1}{9}}\right):\left(\frac{2}{3}+\frac{\frac{7}{15}}{\frac{7}{30}}\right)\)
\(A=\left(\frac{1}{2}-\frac{13}{4}\right):\left(\frac{2}{3}+2\right)\)
\(A=\left(\frac{4}{8}-\frac{26}{8}\right):\left(\frac{2}{3}+\frac{6}{3}\right)\)
\(A=\left(-\frac{11}{4}\right):\left(\frac{8}{3}\right)\)
\(A=\left(-\frac{11}{4}\right).\left(\frac{3}{8}\right)=\frac{-11.3}{4.8}=-\frac{33}{32}.\)
Bn mà trả lời nhanh nhanh thì tốt biết mấy!!!