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