Question

me ajudem por favor

1/2 a - c- (1/2 c -3/4 a)

Answer 1

Olá, tudo bem?

$\dfrac{1}{2}a-c-\dfrac{1}{2}c+\dfrac{3}{4}a=\underbrace{\dfrac{1}{2}a+\dfrac{3}{4}a}-\underbrace{c-\dfrac{1}{2}c}=\\\\\boxed{\dfrac{5a}{4}-\dfrac{3c}{2}}\,\,\text{resposta final}$

É isso!! :)