Question

53-20.(3+8)=

47-53.(15.30)=

Answer 1

$a)\ 53-20\times(3+8)\\ = 53-20 \times (11)\\ = 53-220\\\boxed{=-167}\\\\ b) 47-53\times(15\times30)\\ = 47-53\times(450)\\ = 47-23.850\\\boxed{=-23.803}$