Question

a²+b/b-ab; onde a=8 b=-4

Answer 1

Resposta:

$R={15\over7}$

Explicação passo-a-passo:

${a^2+b\over b-ab}=\\ \\ Se~~a=8~~e~~b=-4\\ \\ {8^2+(-4)\over-4-[(8)(-4)}=\\ \\ {64-4\over-4-(-32)}=\\ \\ {60\over-4+32}=\\ \\ {60\over28}=~~simplificando~~{60:4\over28:4}={15\over7}$