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

Toán Lớp 6: 5 ( x – 9 ) = 350 4. $2^{x}$ – 3 =125 $2^{x}$ + 15 = 31 ( -270 ) : x -20 = 70 ( x + 42) $^{2}$ . 115 =115 ( x + 3) $^{2}$ = 0 4.

Toán Lớp 6: 5 ( x – 9 ) = 350
4. $2^{x}$ – 3 =125
$2^{x}$ + 15 = 31
( -270 ) : x -20 = 70
( x + 42) $^{2}$ . 115 =115
( x + 3) $^{2}$ = 0
4. $x^{2}$ + 2010 = 2015
( -100 ) : ( x + 2 ) = -10
– 3x= 21
12 – x = -7

Comments ( 2 )

  1. 5 ( x – 9 ) = 350
    x – 9 = 350 : 5
    x = 70 + 9
    x = 79
    4 . 2^x – 3 = 125
    4 . 2^x = 125 + 3
    2^x = 128 : 4
    2^x = 32
    2^x = 2^5
    ⇒ x = 5
    2^x + 15 = 31
    2^x = 31 – 15
    2^x = 16
    2^x = 2^4
    ⇒ x = 4
    ( – 270 ) : x – 20 = 70
    – 270 : x = 70 + 20
    x = – 270 : 90
    x = – 3
    ( x + 42 )^2 . 115 = 115
    ( x + 42 )^2 = 115 : 115
    ( x + 42 )^2 = 0
    ( x + 42 )^2 = 0^2
    ⇒ x + 42 = 0
    ⇒ x = 0 – 42
    ⇒ x = – 42
    ( x + 3 )^2 = 0
    ( x + 3 )^2 = 0^2
    ⇒ x + 3 = 0
    ⇒ x = 0 – 3
    ⇒ x = – 3
    4 . x^2 + 2010 = 2015
    4 . x^2 = 2015 – 2010
    x^2 = 5 : 4
    x^2 = ( \sqrt{5}/2 )^2
    ⇒ x = \sqrt{5}/2 hoặc x = – \sqrt{5}/2
    ( – 100 ) : ( x + 2 ) = – 10
    x + 2 = – 100 : ( – 10 )
    x = 10 – 2
    x = 8
    – 3x = 21
    x = 21 : ( – 3 )
    x = – 9
    12 – x = – 7
    x = 12 – ( – 7 )
    x = 12 + 7
    x = 19

  2. Giải đáp:
    x=79
    x=16
    x=8
    x=-3
    Lời giải và giải thích chi tiết:
     

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