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计算. (1) (2) (3) ×[-32÷(- )2+(-2)3] (4) 答案: 解: −3+8−7−15 = 8−25 =-17 解: −212+12÷(−2)×|−83| = −212−12×12×83 = −52−23 = −156−46 = −196 解: |−32| ×[-32÷(- 32 )2+(-2)3] = 32×(−9×49−8) = 32×(−4−8) = 32×(−12) =-18 解: (23−56−78+112)×(−24) = −23×24+56×24+78×24−112×24 =-16+20+21-2 =41-18 =23
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