①56+52÷4
②(123-45)÷3
③21×8+81÷3
④24×5+27×4
⑤(39+13)×8
⑥168-91÷7
5.63-3= 0.5× = +0.75= 3.6÷60%=
4× ÷4× = 0.22= 0.25×16= 0.1+99×0.1=