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練習問題3(正の数・負の数乗法・除法2)解答

練習問題3(正の数・負の数乗法・除法2)


(1)  (-5)²×(-2²)


  =(-5)×(-5)×-(2×2)


  =(+25)×(-4)


  =-100


(2) (-4²)÷(-2)³


  =-(4×4)÷(-2)×(-2)×(-2)


  =(-16)÷(-8)


  =(-16)×(-1/8)


  =+2


(3) 8÷(-6)²×3²


  =8÷(-6)×(-6)×3×3


  =8×(+1/36)×(9)


  =8×1×9/36


  =2


(4) -9-15÷(-3)+6


  =-9+5+6


  =+2



(5)  (-32)÷8-12×(-2)


  =(-4)-(-24)


  =-4+24


  =+20


(6) 2³×(-5)-(-3²)


  =2×2×2×(-5)-(-3×3)


  =8×(-5)-(-9)


  =-40+9


  =-31


(7) (-1)³-(10-4²)


  =(-1)×(-1)×(-1)-(10-4×4)


  =(-1)-(10-16)


  =(-1)-(-6)


  =(-1)+(+6)


  =+5


(8) 8-5×(3-7)


  =8-5×(-4)


  =8-(-20)


  =8+20


  =28


(9) {(-2)²-8÷(1-5)}×(-6)


  ={(-2)×(-2)-8÷(-4)}×(-6)


  ={4-8×(-1/4)}×(-6)


  =(4+2)×(-6)


  =(+6)×(-6)


  =-36

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