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

Toán Lớp 6: Bài 1.Viết kết quả các phép tính sau dưới dạng lũy thừa 4^8.8^4 5^12.7-5^11.10 2^20.15+2^10.85 〖27〗^16:9^10 〖125〗^3:〖25〗^4 〖24〗^4

Toán Lớp 6: Bài 1.Viết kết quả các phép tính sau dưới dạng lũy thừa
4^8.8^4
5^12.7-5^11.10
2^20.15+2^10.85
〖27〗^16:9^10
〖125〗^3:〖25〗^4
〖24〗^4:3^4-〖32〗^12:〖16〗^12

Comments ( 2 )

  1. text{Bài 1:}
    $a)4^{8}.8^{4}$
    $=4^{8}.2^{4}.4^{4}$
    $=4^{8+4}.2^{4}$
    $=4^{12}.(2^{2})^2$
    $=4^{12}.4^{2}$
    $=4^{12+2}$
    $=4^{14}$
    $b)5^{12}.7-5^{11}.10$
    $=5^{11}.5.7-5^{11}.10$
    $=5^{11}(35-10)$
    $=5^{11}.25$
    $=5^{11}.5^{2}$
    $=5^{13}$
    $c)2^{20}.15+2^{10}.85$
    $=2^{20}.2^{10}(15+85)$
    $=2^{30}.100$
    $=2^{30}.10^{2}$
    $d)27^{16}:9^{10}$
    $=(3^{3})^{16}:(3^{2})^{10}$
    $=3^{48}:3^{20}$
    $=3^{48-20}$
    $=3^{28}$
    $e)125^{3}:25^{4}$
    $=(5^{3})^{3}:(5^{2})^{4}$
    $=5^{9}:5^{8}$
    $=5^{1}=5$
    $f)24^{4}:3^{4}-32^{12}:16^{12}$
    $=(24:3)^{4}-(32:16)^{12}$
    $=8^{4}-2^{12}$
    $=(2^{3})^{4}-2^{12}$
    $=2^{12}-2^{12}$

  2. 4^8 · 8^4 = (2^2)^8 · (2^3)^4 = 2^16 · 2^12 = 2^28  
    5^12 · 7 – 5^11 · 10 = 5^11 · 7 (5 – 3) = 5^11 · 7 · 2 = 5^11 · 14
    2^20 · 15+2^10 · 85 = 2^10 · 15(2^10 + 70)
    27^16:9^10 = frac{(3^3)^16}{(3^2)^10} = frac{3^48}{3^20} = 3^28
    125^3:25^4 = frac{(5^3)^3}{(5^2)^4} = frac{5^9}{5^8} = 5
    24^4 : 3^4 – 32^12:16^12 = 24^4 : 3^4 – (2^5)^12 : (2^4)^12
    = 8^4 – 2^12 = (2^3)^4 – 2^12
    = 2^12 – 2^12 = 0 

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

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