96÷16=(96 )÷(16÷4)
210÷42=(210×2)÷(42 )
600–155-45=600-(155 )
①372×34=
②310×55=
③405×19=
④16×185=
⑤750×40=
⑥307×36=
45×0.945 3.8﹣3.7 ÷1