+ =1- =
+ + =1- =
+ + + =1- =
=-
① + + +
②4- -
③ -( + )
④ - +
⑤ + + + +
①(-+)×24
②14.86﹣(6.28+2.36)﹣3.72
③÷[÷(-)]
④2.4×3.6+3.2×4.8
⑤+++......++
⑥××18×24