Question

calcule o valor das expressões a) 7×4-8×0,5. b) 1×9+7,2÷4​

Answer 1

a)

$\boxed{\boxed{\mathsf{7\times4-8\times0,5=28-4=24}}}$

b)

$\boxed{\boxed{\mathsf{1\times9+7,2\div4=9+1,8=10,8}}}$