Question

Решите пожалуйста!!Срочно надо

Answer 1

$displaystyle tt a). left(-frac{3}{5}cdot0,8-frac{13}{25}right)cdot0,7=(-0,6cdot0,8-0,52)cdot0,7=\\{} =(-0,48-0,52)cdot0,7=-1cdot0,7=-0,7;\\\b). (-2,6)^{2}-(-3,2)cdotleft(-frac{3}{8}right)+(-6,56)=6,76-3,2cdot0,375-6,56=\\{} =0,2-1,2=-1;\\\c). 0,9cdotbigg(frac{4}{5}cdot(-0,2)-frac{21}{26}bigg)=0,9cdotbigg(-0,16-frac{21}{26}bigg)=-0,144-frac{189}{260}=\\{} =-frac{144}{1000}-frac{189}{260}=-frac{5661}{6500};$

$displaystyle tt d). 16,09-(-8,4)cdotbigg(-frac{7}{12}bigg)-(-3,7)^{2}=16,09-frac{84}{10}cdotfrac{7}{12}-13,69=\\{} =2,4-4,9=-2,5;$