45 x 16 - 17                        =45 x (15+1) -17                =        45 x 15 +45 -17         =45 x 15 +28      =1

45 x 15 +28                           GIỮ NGUYÊN                  =         giữ nguyên            = giữ nguyên

Nè bạn k đi

\(\frac{45\times16-17}{45\times15+28}=\frac{45\times15+45-17}{45\times15+28}=\frac{45\times15+28}{45\times15+28}=1\)

\(\frac{45x16-17}{45x15+28}=\frac{45x15+45-17}{45x15+28}=\frac{45x15+28}{45x15+28}=1\)

45.15+45-17
45.15+28
=45.15+28
45.15+28
=1
dấu nhân là dấu chấm nha

a) \(\dfrac{5\times6\times12}{6\times12\times7}=\dfrac{5}{7}\)

b) \(\dfrac{9\times8\times15}{15\times9\times16}=\dfrac{1}{2}\)

\(\frac{45\times16+17}{45\times15+28}=\frac{16+17}{15+28}=\frac{33}{43}\)

\(\frac{45.16+17}{45.15+28}=\frac{737}{703}\)

Lê Tuyết Anh chép sai đề rồi ! phải là 45 x 16 -17 / 45 x 15 + 28

=1394,32

= 45 x 16 - 45 x 15 +17 : 28

= 45 x ( 16 - 15 ) + 17 : 28

= 45 x 1 + 17 : 28

= 45 + 17/28

=1277/28

=(45 x 16 + 45 x 15) - 17/28

= 45x(16+15) - 17/28

= 45x 31 - 17/28

= 1395 - 17/28 

= 39043/28

\(\frac{45\cdot16-17}{45\cdot15+28}\)

\(=\frac{45\cdot\left(15+1\right)-17}{45\cdot15+28}\)

\(=\frac{45\cdot15+45-17}{45\cdot15+28}\)

\(=\frac{45\cdot15+28}{45\cdot15+28}\)

\(=1\)

nếu thấy đúng thì k cho mh nhaMa kết lạnh lùng

\(\frac{45\times16-17}{45\times15+28}\)

\(=\frac{45\times15+45-17}{45\times15+28}\)

\(=\frac{45\times15+28}{45\times15+28}\)

\(=1\)

45 * ( 15 + 1 ) - 17 / 45 * 15 + 28

45 * 15 + 45 - 17 / 45 * 15 + 28

45 * 15 + 28 / 45 * 15 + 28

1

\(=2-\left(\dfrac{5}{3}-\dfrac{7}{6}+\dfrac{9}{10}-...-\dfrac{19}{45}\right)\)

\(=2-2\left(\dfrac{5}{6}-\dfrac{7}{12}+\dfrac{9}{20}-...-\dfrac{19}{90}\right)\)

\(=2-2\left(\dfrac{1}{2}+\dfrac{1}{3}-\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{4}+\dfrac{1}{5}-...-\dfrac{1}{9}-\dfrac{1}{10}\right)\)

\(=2-2\cdot\dfrac{4}{10}=2-\dfrac{8}{10}=2-\dfrac{4}{5}=\dfrac{6}{5}\)

 45 x 16 - 17 = 703                       

                   28 +45 x 15 = 703