24×(-+) ÷[×(-)]
15.28﹣3.99﹣9.01 10.7﹣2.9×0.2÷0.58
①1.25×0.96×80
②55× +3÷7
③ ×[ ÷( - )]
④ + + + (提示: - = )
+1 ÷1 8.99×9.9990