Question

11. Calculati:d)-18 supra 36 +1 supra 9 +0,1(5)-0,1(25).

Answer 1

Răspuns:

Explicație pas cu pas:

$-\frac{18}{36}+\frac{1}{9}+0,1(5)-0,1(25)=?\\\\-\frac{1}{2}+\frac{1}{9}+\frac{15-1}{90}-\frac{125-1}{990}=?\\\\-\frac{1}{2}+\frac{1}{9}+\frac{14}{90}-\frac{124}{990}=?\\\\-\frac{1}{2}+\frac{1}{9}+\frac{7}{45}-\frac{62}{495}=?\\\\-\frac{495}{990}+\frac{110}{990}+\frac{154}{990}}-\frac{124}{990}=\frac{-495+110+154-124}{990}=\boxed{\bold{-\frac{355}{990}=-0,3(58)}}$