+ =
﹣ =
+ + =
3 ﹣ ﹣ =
﹣( + )=
11﹣ ﹣ =
﹣( ﹣ )=
①
②
③
④
⑤
⑥
+ = +0.625= - = - = 112=
1- = 2.5- = 1- - = -( - )=
① +
③28×
④ + -
⑤ -( + )