题目
计算:
(1)
|﹣2|+|﹣10|﹣|﹣5|
(2)
(﹣3.5)+(+8 )﹣(﹣5.5)+(﹣2 )
(3)
﹣42+3×(﹣2)2×( -1)÷(﹣1 )
(4)
( ﹣ ﹣ )×(﹣24)+42÷(﹣2)3+(﹣1)2019
答案: 解:|﹣2|+|﹣10|﹣|﹣5| =2+10﹣5 =7.
解:(﹣3.5)+(+8 23 )﹣(﹣5.5)+(﹣2 23 ) =﹣3.5+5.5+(8 23 ﹣2 23 ) =2+6 =8.
解:﹣42+3×(﹣2)2×( 13 -1)÷(﹣1 13 ) =﹣16+3×4×(﹣ 23 )×(﹣ 34 ) =﹣16+6 =﹣10;
解:( 23 ﹣ 12 ﹣ 54 )×(﹣24)+42÷(﹣2)3+(﹣1)2019 = 23 ×(﹣24)+24× 12 +24× 54 ﹣2﹣1 =﹣16+12+30﹣2﹣1 =﹣19+42 =23.