①5- - =
② + + =
③ -2.75-(0.25+ )
④ + + +
⑤ -( + )
⑥ + +
6﹣
99×5.7+5.7
2.4×12.5
①54×98
②(+﹣)×24
③4.86×[1÷(2.1﹣2.09)]
④8﹣