PEMDAS is actually fairly new, I didn’t learn it at school but much later. It’s not a perfect rule and does not consider implicit multiplication.
2(2+2) has implicit multiplication, just like in algebra. If you replace (2+2) with x, you get:
8 / 2x = 4 / x = 4 / (2+2) = 1
You wouldn’t write 2x if the x was supposed to be separate and on top of the fraction, similarly you wouldn’t write 2(2+2) if the (2+2) was supposed to be on top.
PEMDAS is actually fairly new, I didn’t learn it at school but much later. It’s not a perfect rule and does not consider implicit multiplication.
2(2+2) has implicit multiplication, just like in algebra. If you replace (2+2) with x, you get:
8 / 2x = 4 / x = 4 / (2+2) = 1
You wouldn’t write 2x if the x was supposed to be separate and on top of the fraction, similarly you wouldn’t write 2(2+2) if the (2+2) was supposed to be on top.