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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