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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: cứu mik có 2 câu thôi dễ lém đề bài là :” b) √0,001 . 5 – √0,25 . 4 c) 10 mũ 3 + 2.5 mũ 3 + 5 mũ 3 / 55

Toán Lớp 7: cứu mik có 2 câu thôi dễ lém đề bài là :” b) √0,001 . 5 – √0,25 . 4
c) 10 mũ 3 + 2.5 mũ 3 + 5 mũ 3 / 55

Comments ( 2 )

  1. b) \sqrt{0,001 . 5} – \sqrt{0,25 . 4}
    = \sqrt{0,005} – \sqrt{1}
    = \frac{\sqrt{2}}{20} – 1
    = \frac{-20 + \sqrt{2}}{20}
    c) 10^3 + 2.5^3 + \frac{5^3}{55}
    = 10^3 + 10 . 5 ^2 + \frac{5^3}{5.11}
    = 1250  + \frac{5^2}{11}
    = \frac{1250 . 11}{11} + \frac{5^2}{11}
    =\frac{13750 + 5^2}{11}
    = \frac{13775}{11}

  2. b) \sqrt{0,001} . 5 – \sqrt{0,25} . 4
    = \sqrt{0,001 . 5} – \sqrt{0,25 . 4}
    = \sqrt{0,005} – \sqrt{1}
    = frac{\sqrt{2}}{20} – 1
    = frac{-20 + \sqrt{2}}{20}
    c) frac{10^3 + 2 . 5^3 + 5^3}{55}
    = frac{(2.5)^3 + 2 . 5^3 + 5^3}{5 . 11}
    = frac{2^3 . 5^3 + 2 . 5^3 + 5^3}{5 . 11}
    = frac{(2^3 + 2 + 1) . 5^3}{5 . 11}
    = frac{5^3 . 11}{5 . 11}
    = frac{5^3}{5}
    = 5^2

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222-9+11+12:2*14+14 = ? ( )