题目

用你喜欢的方法计算. (1) × + ÷ (2) ( ﹣ )÷( × ) (3) + + + (4) 65×( + ) 答案: 解: 235 × 910 + 275 ÷ 109 = 235 × 910 + 275 × 910 =( 235 + 275 )× 910 =10× 910 =9 解:( 89 ﹣ 13 )÷( 718 × 23 ) = 59 ÷ 727 = 157 解: 13×4 + 14×5 + 15×6 + 16×7 = 13 ﹣ 14 + 14 ﹣ 15 + 15 ﹣ 16 + 16 ﹣ 17 = 13 ﹣ 17 = 421 解:65×( 113 + 35 ) =65× 113 +65× 35 =5+39 =44
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