a)-43.(1-296)-296.43 b)13.(5+17)+5.(3-17) c)(-15+1)+(-15+2)+…+(-15+100)

Bởi

a)-43.(1-296)-296.43
b)13.(5+17)+5.(3-17)
c)(-15+1)+(-15+2)+…+(-15+100)

0 bình luận về “a)-43.(1-296)-296.43 b)13.(5+17)+5.(3-17) c)(-15+1)+(-15+2)+…+(-15+100)”

  1. $-43.(1-296)-296.43$

    $=-43.1-296-296.43$

    $=-43-(296-296).43$

    $=-43-0.43$

    $=-43-0$

    $=-43$

    $13.(5+17)+5.(-3-17)$

    $=13.5+17+5.(-3)-17$

    $=65+17+(-15)-17$

    $=[65+(-15)]+(17-17)$

    $=50+0$

    $=50$

    $(-15+1)+(-15+2)+..+(-15+100)$

    $=-15.100+5050$

    $=-1500+5050$

    $=-3550$

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