题目
计算下列各题:
(1)
3.587-(-5)+(-5 )+(+7)-(+3 )-(+1.587);
(2)
(-1)5×{[-4 ÷(-2)2+(-1.25)×(-0.4)]÷(- )-32}.
答案: 解:原式=3.587+5-5 12 +7-3 14 -1.587 =(3.587-1.587)+(5+7)+(-5 12 -3 14 ) =2+12-8 34 =5 14 .
解:原式=-1×{[- 143 ÷4+0.5]÷(- 19 )-9} =-1×[(- 23 )÷(- 19 )-9] =-1×(6-9) =-1×(-3) =3.