①
②
③
④
⑤
⑥
+ = + = 2- = + =
- = - = 0.25= 1- + =
①125×89×8
②215×85+215×15
③33+57-6.72-4.28
④8.29+3.7+0.71+6.3
⑤ - +
⑥2- -