题目

计算下面各题. ① + × ÷ ② × ﹣ ﹣ ③ × ÷ × ④ × + × ⑤(12÷ ﹣ )× ⑥ ÷[( ﹣ )× ] 答案:①35+712×514÷258 =35+524×825 =35+115 =23 ②109×185-1113-1513 =4-(1113+1513) =4-2 =2 ③712×910÷712×910 =(712÷712)×(910×910) =1×81100 =81100 ④715×613+613×815 =613×(715+815) =613×1 =613 ⑤(12÷34-635)×107 =(16-635)×107 =175×107 =347 ⑥89÷[(23-35)×56] =89÷[115×56] =89÷118 =16
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