①
②
③
④7÷13+3×
⑤
⑥
35× = ÷ = × = - ×0=
- = ÷4= + = 3.4- - =
0.333
① - -
② -( + )
③ + -
④
① -( - )-
②875-375÷25
③12.5×32×0.25
④48×75%+53× -0.75