用简便方法计算
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2014-07-25 · 知道合伙人教育行家
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(-8)×7×0.125×(-3/7)
=[(-8)×0.125]×[7×(-3/7)]
=(-1)×(-3)
=3
-100×(3/10-1/2+1/5-0.1)
=(-100)×3/10-(-100)×1/2+(-100)×1/5-(-100)×0.1
=-30+50-20+10
=10
6.868×(-5)+6.868×(-12)+17×6.868
=6.868×[(-5)+(-12)+17]
=6.868×0
=0
9又18/19×(-19)
=(10-1/19)×(-19)
=10×(-19)-1/19×(-19)
=-190+1
=-189
=[(-8)×0.125]×[7×(-3/7)]
=(-1)×(-3)
=3
-100×(3/10-1/2+1/5-0.1)
=(-100)×3/10-(-100)×1/2+(-100)×1/5-(-100)×0.1
=-30+50-20+10
=10
6.868×(-5)+6.868×(-12)+17×6.868
=6.868×[(-5)+(-12)+17]
=6.868×0
=0
9又18/19×(-19)
=(10-1/19)×(-19)
=10×(-19)-1/19×(-19)
=-190+1
=-189
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