Question

[(4,78+2,42).104]:100

Answer 1

$[(4,78 + 2,42) \times 104] : 100 = \\ \\ 4,78 = \frac{478}{100} = \frac{239}{50} \\ \\ 2,42 = \frac{242}{100} = \frac{121}{50} \\ \\ 4,78 + 2,42 = \frac{239}{50} + \frac{121}{50} = \frac{239 + 121}{50} = \frac{360}{50} = \frac{36}{5} \\ \\ \frac{36}{5} \times 104 = \frac{36 \times 104}{5 \times 1} = \frac{3744}{5} \\ \\ \frac{3744}{5} : 100 = \frac{3744}{5} \times \frac{1}{100} = \frac{3744 \times 1}{5 \times 100} = \frac{3744}{500} = \frac{936}{125} = 7 \frac{61}{125} = 7,488$

Answer 2

[( 4 , 78 + 2 , 42 ) × 104 ] : 100 =

( 7 , 2 × 104 ) : 100 =

748,8 :100 =

=7 , 488