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

Toán Lớp 6: Bài 1 : a) (5⁴+4⁷).(8⁹-2⁷).(2⁴-4²) b)(169-4²).(169-5²)-(169-13²) c)(7²⁰⁰³+7²⁰⁰²):7²⁰⁰¹ bài 2 : a) 2⁴.x-3².x=145-225:51 b)580:(x-24)=

Toán Lớp 6: Bài 1 :
a) (5⁴+4⁷).(8⁹-2⁷).(2⁴-4²)
b)(169-4²).(169-5²)….(169-13²)
c)(7²⁰⁰³+7²⁰⁰²):7²⁰⁰¹
bài 2 :
a) 2⁴.x-3².x=145-225:51
b)580:(x-24)=329-150.2¹
c) 7.(x-14)+35=25+279:9

Comments ( 1 )

  1. Lời giải và giải thích chi tiết:
    1)
    a)
    (5^4 + 4^7)(8^9 – 2^7)(2^4 – 4^2)
    = (5^4 + 4^7)(8^9 – 2^7)(16 – 16)
    = (5^4 + 4^7)(8^9 – 2^7) . 0
    = 0
    b)
    (169 – 4^2)(169 – 5^2)………(169 – 13^2)
    = (169 – 4^2)(169 – 5^2)………(169 – 169)
    = (169 – 4^2)(169 – 5^2)………0
    = 0
    c)
    (7^2003 + 7^2002) : 7^2001
    = 7^2003 : 7^2001 + 7^2002 : 7^2001
    = 7^2 + 7
    = 49 + 7
    = 56
    2)
    a)
    2^4 . x – 3^2 . x = 145 – 225 : 51
    ⇒ x . (16 – 9) = 2390/17
    ⇒ x . 7 = 2390/17
    ⇒ x = 2390/119
    b)
    580 : (x – 24) = 329 – 150 . 2^1
    ⇒ 580 : (x – 24) = 329 – 300 = 29
    ⇒ x – 24 = 20
    ⇒ x = 44
    c)
    7(x – 14) + 35 = 25 + 279 : 9
    ⇒ 7(x – 14) + 35 = 25 + 31 = 56
    ⇒ 7(x – 14) = 21
    ⇒ x – 14 = 3
    ⇒ x = 17

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