题目

脱式计算,能简算的要简算 (1) - ×( + ) (2) ÷[( - )× ] (3) ( + - )×24 答案: 67 - 67 ×( 23 + 19 ) = 67 - 67 ×( 69 + 19 ) = 67 - 67 × 79 = 67 ×(1- 79 ) = 67 × 29 = 1263 72 ÷[( 34 - 58 )× 45 ] = 72 ÷[ 18 × 45 ] = 72 ÷ 110 = 72 ×10 =35 ( 78 + 73 - 56 )×24 = 78 ×24+ 73 ×24- 56 ×24 =21+56-20 =57
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