题目

   ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ 答案：① −12+3−5+6 = −12−5+3+6 = −8 ② (−32)÷8×(−4) = 32÷8×4 = 16 ③ 5−(−2.5)+(−0.5)−3 = 5+2.5−0.5−3 = 4 ④ (−2)×(−32)÷(−34) = −2×32×43 = −4 ⑤ 1+(13−14−16)×(−48) = 1+13×(−48)−14×(−48)−16×(−48) = 1-13×48+14×48+16×48 = 1-16+12+8 = 5 ⑥ (−1)8+8÷(−2)3−(−4)×(−3) = 1+8÷(−8)−12 = 1−1−12 = −12 ⑦ −215×(13−12)×511÷(−0.75) = −115×(−16)×511×(−43) = −115×16×511×43 = −29 ⑧ (−32)÷(−225)−(−2)3×512−5×53÷4 = (−9)÷(−125)−(−8)×512−5×53÷4 = 9×512+8×512−5×53×14 = 9×512+8×512−5×512 = (9+8−5)×512 = 12×512 = 5

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