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计算 ① + + ② + - ③ -( + ) ④1- - ⑤ + + + 答案:①16+15+14 =1060+1260+1560 =3760 ②57+14-914 =2028+728-1828 =928 ③35-(215+13) =35-715 =215 ④1-18-78 =1-(18+78) =1-1 =0 ⑤14+13+14+23 =(14+14)+(13+23) =12+1 =112
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