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Answers ( 6 )
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    We have:20+30+40+50+60+70+80

    = ( 20 + 30 + 40 ) + (60 + 70 + 80) + 50

    = 30 . 3 + 70 .3 + 50

    = 100.3 + 50

    = 300 + 50

    = 350

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    We have:a3+b3+c3-3abc

    =a3+3a2b+3ab2+b3+c3-3abc-3a2b-3ab2

    =(a+b)3+c3-3ab(a+b+c)

    =(a+b+c)[(a+b)2-(a+b).c+c2]-3ab(a+b+c)

    =(a+b+c)(a2+b2+c2-ac-ab-bc)

  • See question detail

    You don't speak Vietnamese here.You must speak English

    You are violating rules.

    You should redress.Are you okayy..?


     

  • See question detail

    We have:g(-3)=2.(-3)+4=-6+4=-2

    \(\Rightarrow\)f(g(-3))=f(-2)=(-2)2-2=4-2=2

  • See question detail

    Change:3 dozen oranges=36 oranges

    The cost of a orange is:

    90:4=22,5(cents)

    The cost of 3 dozen oranges is:

     22,5 x 36=810(cents)

  • See question detail

    You don't speak Vietnamese here.You must speak English

    You are violating rules.

    You should redress.Are you okayy..?

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