Question

Решите 4,2*(0,25+x)=147
(4,5-y)*5,8=8,7
здесь 2 упражнения

Answer 1

4,2*(0,25+x)=147
1,05+4,2x=147
4,2x=147-1,05
4,2x=145,96

x=$frac{145,96}{4,2} = 145 frac{96}{100} : 4 frac{2}{10} = 145 frac{24}{25} : 4 frac{1}{5} = frac{3649}{25} : frac{21}{5} = frac{3649}{25} * frac{5}{21} = frac{3649}{5} * frac{1}{21} =$$frac{3649}{105} = 34 frac{79}{105}$

x=$34 frac{79}{105}$

(4,5-y)*5,8=8,7
26,1-5,8y=8,7
-5,8y=8,7-26,1
-5,8y=-17,4

y=$frac{-17,4}{-5,8} = 3$
y=3