题目
计算
① ② ③ ④ ⑤ ⑥
答案:解:① -8+7-2 =-3; ② 2×(-3)+4 =-2; ③ 23−18−(−13)+(−38) = 23−18+13−38 = 12 ; ④ −9×23÷(−4)×14 = 9×23×14×14 = 38 ; ⑤ (−24)×(−12+34−13) = 24×(12−34+13) = 12×24−34×24+13×24 =12-18+8 =2; ⑥ −14−[1−(1−0.5×13)]×6 = −1−[1−(1−12×13)]×6 = −1−(1−56)×6 = −1−16×6 =-2