Question

Transformar los decimales a fracciones
a.1/5×(1,25 +3)-3(2-0,1)=
b. 7/4×(-2/21)+0,6×(-5/4)-5×1,2
Si me ayudan pliss con explicación les doy coronita ​

Answer 1

Respuesta:

a) -137/20. b) -83/12

Explicación paso a paso:

a)

$\frac{1}{5} \times (1.25 + 3) - 3(2 - 0.1) \\ \frac{1.25}{1} \times \frac{100}{100} = \frac{125}{100} = \frac{5}{4} \\ \\ \frac{0.1}{1} \times \frac{10}{10} = \frac{1}{10} \\ \\ \frac{1}{5} \times ( \frac{5}{4} + 3) - 3(2 - \frac{1}{10} ) \\ \\ ( \frac{1}{4} + \frac{3}{5} ) - (6 - \frac{3}{10} ) \\ ( \frac{5 + 12}{20} ) - ( \frac{60 - 3}{10} ) \\ \\ ( \frac{17}{20} ) - ( \frac{77}{10} ) \\ \\ \frac{17 - 154}{20} \\ - \frac{137}{20}$

b)

$\frac{7}{4} ( - \frac{2}{21} ) + 0.6( - \frac{5}{4} ) - 5 \times 1.2 \\ \\ \frac{0.6}{1} \times \frac{10}{10} = \frac{6}{10} = \frac{3}{5} \\ \\ \frac{1.2}{1} \times \frac{10}{10} = \frac{12}{10} = \frac{6}{5} \\ \\ \frac{7}{4} ( - \frac{2}{21} ) + \frac{3}{5} ( - \frac{5}{4} ) - 5( \frac{6}{5} ) \\ \\ - \frac{1}{6} - \frac{3}{4} - 6 \\ \\ \frac{ - 4 - 18 - 144}{24} \\ \\ - \frac{166}{24} \\ - \frac{83}{12}$