题目
计算:
(1)
(2)
(3)
(4)
答案: 解:原式= 9−8+10−2−9 =9+10-8-2-9 =19-19 =0;
解:原式= (−35)×312×54×17 = −35×72×54×17 = −38 ;
解:原式= −9÷214×49+4−4×(−13) = −9×49×49+4+43 = −169+4+43 = 329 ;
解:原式= 991225×(−2)+991225×27 = 991225×(−2+27) = (100−1325)×25 =2500-13 =2487.