Question

Tính 

a/ 97 x 327 + 327 x 3

b/ \(\frac{1}{7}x\frac{4}{23}+\frac{1}{7}x\frac{25}{23}+\frac{1}{7}x\frac{17}{23}+5x\frac{1}{7}\)

Answer 1

\(a,97\times327+327\times3\)

\(=327\times\left(97+3\right)\)

\(=327\times100\)

\(=32700\)

\(b,\frac{1}{7}\times\frac{4}{23}+\frac{1}{7}\times\frac{25}{23}+\frac{1}{7}\times\frac{17}{23}+5\times\frac{1}{7}\)

\(=\frac{1}{7}\times\left(\frac{4}{23}+\frac{25}{23}+\frac{17}{23}+5\right)\)

\(=\frac{1}{7}\times7\)

\(=1\)

Answer 2

a) 97 x 327 + 327 x 3

   = (97 + 3) x 327

   = 100 x 327 = 32700

b) \(\frac{1}{7}\times\frac{4}{23}+\frac{1}{7}\times\frac{25}{23}+\frac{1}{7}\times\frac{17}{23}+5\times\frac{1}{7}\)

   \(=\frac{1}{7}\times\left(\frac{4}{23}+\frac{25}{23}+\frac{17}{23}+5\right)\)

    \(=\frac{1}{7}\times7=\frac{7}{7}=1\)