题目
脱式计算,能简算的要简算
(1)
× ÷ ×
(2)
48×( )
(3)
- ÷
(4)
[ -( - )]÷
(5)
÷ + ×
(6)
- -
答案: 解: 83×75÷83×75 = 5615÷83×75 = 75×75 = 4925
解:48×( 124+512+13 ) =48× 1924 =38
解: 12−425÷25 = 12 - 25 = 110
解:[ 12 -( 34 - 35 )]÷ 710 =[ 12 - 320 ]÷ 710 = 720 × 107 = 12
解: 79 ÷ 115 + 29 × 511 = 79 × 511 + 29 × 511 =( 79 + 29 )× 511 =1× 511 = 511
解: 98−57−27 = 98 -( 57+27 ) = 98 -1 = 18