Question

2/7(1,4а-3 1/2)+0,5а,при а=-0,1

Answer 1

$frac{2}{7} *(-0,14-3,5)-0,05= frac{2}{7}*(-3,64)- frac{1}{20} = frac{2}{7} *( -frac{91}{25} )- frac{1}{20} =$$-2* frac{13}{25}- frac{1}{20} =- frac{26}{25} - frac{1}{20} =- frac{109}{100} =-1 frac{9}{100} =-1,09$