题目

计算 (1) (2) (-2.25)-( )+( )-(-0.125) (3) -32+( )2×( ) (4) 答案: 解:原式=(-24)×(-34)+(-24)×56+(-24)×(-78) =18-20+21 =19; 解:原式= (-214)- ( +58 )+( −34 ) - (-18) =(-214)+( −34 )- ( +58 )- (-18) =-3-12 =-72; 解:原式=-9+254×( −425 ) =-9-1 =-10; 解:原式=2-2+3+2-1 =2+3-1-2+2 =4.  
数学 试题推荐
最近更新