题目
计算或化简:
(1)
(2)
(3)
(4)
答案: 解: 9+(−17)+(−23)+21 =9-17-23+21 =-10
解: 12x−2(x−13y2)+(−32x+13y2) = 12x−2x+23y2−32x+13y2 = (12x−2x−32x)+(23y2+13y2) = −3x+y2
解: (−76+1112+14)×24 = −76×24+1112×24+14×24 = −28+22+6 =0
解: −12021+(−2)3×(−12)−|−1−2| = −1+(−8)×(−12)−3 = −1+4−3 =0.