题目

下面各题怎样简便就怎样算. (1) + ÷4 (2) 2.5× ×0.4× (3) ( ﹣ )÷ (4) ÷(3﹣ ﹣ ) 答案: 57 + 27 ÷4 = 57 + 114 = 1114 2.5× 38 ×0.4× 49 =(2.5×0.4)×( 38 × 49 ) =1× 16 = 16 ( 23 ﹣ 58 )÷ 124 =( 23 ﹣ 58 )×24 = 23 ×24﹣ 58 ×24 =16﹣15 =1 718 ÷(3﹣ 715 ﹣ 815 ) = 718 ÷[3﹣( 715 + 815 )] = 718 ÷[3﹣1] = 718 ÷2 = 736
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