a) 52,75 * 97 + 3 * 52,75
= 52,75 * ( 97 + 3 )
= 52,75 * 100 = 5275
b) 49,08 * 57 + 49,08 * 63 - 49,08 * 20
= 49,08 * ( 57 + 63 - 20 )
= 49,08 * 100 = 4908
c) ( 98 + 50,1 ) * 36 + ( 220,1 - 72 ) * 64
= 148,1 * 36 + 148,1 * 64
= 148,1 * ( 36 + 64 )
= 148,1 * 100 = 14810
d) \(2\cdot5,4\cdot\frac{2}{5}+3\cdot3,6\cdot\frac{7}{5}-10,8\div\frac{5}{4}\)
\(=10,8\cdot\frac{2}{5}+10,8\cdot\frac{7}{5}-10,8\cdot\frac{4}{5}\)
\(=10,8\cdot\left(\frac{2}{5}+\frac{7}{5}-\frac{4}{5}\right)\)
= 10,8 * 1 = 10,8
a) 52,75 x 97 + 3 x 52,75 = 52,75 x (97 + 3) = 52,75 x 100 = 5275
b) (98 + 50,1) x 36 + (220,1 - 72) x 64 = 148,1 x 36 + 148,1 x 64 = 148,1 x (36 + 64) = 148,1 x 100 = 14810
c) 49,08 x 57 + 49,08 x 63 - 49,08 x 20 = 49,08 x (57 + 63 - 20) = 49,08 x 100 = 4908
d) \(2.5,4.\frac{2}{5}+3.3,6.\frac{7}{5}-10,8:\frac{5}{4}\)
\(=10,8.\frac{2}{5}+10,8.\frac{7}{5}-10,8.\frac{4}{5}=\)\(10,8.\left(\frac{2}{5}+\frac{7}{5}-\frac{4}{5}\right)=10,8.\frac{5}{5}=10,8.1=10,8\)
