怎么做?! 10
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9、
(1)-2.5÷5/8×(-1/4)
=-5/2×8/5×(-1/4)
=-4×(-1/4)
=1
(2)-27÷2又1/4×4/9÷(-24)
=-27÷9/4×4/9÷(-24)
=-27×4/9×4/9×(-1/24)
=-4/3×4/9×(-1/24)
=-16/27×(-1/24)
=2/81
(3)(-54)×2又1/4÷(-4又1/2)×2/9
=(-54)×9/4÷(-9/2)×2/9
=(-54)×9/4×(-2/9)×2/9
=(-54)×(-1/2)×2/9
=27×2/9
=6
(4)-4×1/2÷(-1/2)×2
=-2×(-2)×2
=8
(5)-5÷(-1又2/7)×4/5×(-2又1/4)÷7
=-5÷(-9/7)×4/5×(-9/4)×1/7
=-5×(-7/9)×4/5×(-9/4)×1/7
=-5×4/5×(-7/9)×(-9/4)×1/7
=-4×7/4×1/7
=-1
(6)|-1又1/8|÷3/4×4/3×|-1/2|
=9/8×4/3×4/3×1/2
=9/8×16/9×1/2
=1
(7)(-8)÷【(-3/8)×(-3/8)】×(-2又1/4)
=(-8)÷9/64×(-9/4)
=(-8)×64/9×(-9/4)
=(-8)×(-16)
=128
(8)(-1/2+1/3)×0.6÷(-1又3/4)×|-2.5|
=(-1/6)×0.6÷(-7/4)×5/2
=-1/10×(-4/7)×5/2
=2/35×5/2
=1/7
(1)-2.5÷5/8×(-1/4)
=-5/2×8/5×(-1/4)
=-4×(-1/4)
=1
(2)-27÷2又1/4×4/9÷(-24)
=-27÷9/4×4/9÷(-24)
=-27×4/9×4/9×(-1/24)
=-4/3×4/9×(-1/24)
=-16/27×(-1/24)
=2/81
(3)(-54)×2又1/4÷(-4又1/2)×2/9
=(-54)×9/4÷(-9/2)×2/9
=(-54)×9/4×(-2/9)×2/9
=(-54)×(-1/2)×2/9
=27×2/9
=6
(4)-4×1/2÷(-1/2)×2
=-2×(-2)×2
=8
(5)-5÷(-1又2/7)×4/5×(-2又1/4)÷7
=-5÷(-9/7)×4/5×(-9/4)×1/7
=-5×(-7/9)×4/5×(-9/4)×1/7
=-5×4/5×(-7/9)×(-9/4)×1/7
=-4×7/4×1/7
=-1
(6)|-1又1/8|÷3/4×4/3×|-1/2|
=9/8×4/3×4/3×1/2
=9/8×16/9×1/2
=1
(7)(-8)÷【(-3/8)×(-3/8)】×(-2又1/4)
=(-8)÷9/64×(-9/4)
=(-8)×64/9×(-9/4)
=(-8)×(-16)
=128
(8)(-1/2+1/3)×0.6÷(-1又3/4)×|-2.5|
=(-1/6)×0.6÷(-7/4)×5/2
=-1/10×(-4/7)×5/2
=2/35×5/2
=1/7
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