题目

计算下面各题. (1) ÷7× (2) ( + )÷ + (3) ( + × )÷ (4) 5.3× +2.7×25% 答案: 215 ÷7× 59 = 215 × 17 × 59 = 35 × 59 = 13 ( 13 + 14 )÷ 12 + 56 =( 13 + 14 )×2+ 56 = 23 + 12 + 56 = 46 + 36 + 56 =2 ( 23 + 415 × 56 )÷ 2021 =( 23 + 29 )× 2120 =( 69 + 29 )× 2120 = 89 × 2120 = 1415 5.3× 14 +2.7×25% =5.3× 14 +2.7× 14 =(5.3+2.7)× 14 =8× 14 =2
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