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

Toán Lớp 7: `a“)` `( 2x – 1 ) ` $^{3}$ `=` `8` `b ) ( 2x – 3 )` $^{2}$ `= 9`

Home/ Toán Lớp 7: `a“)` `( 2x – 1 ) ` $^{3}$ `=` `8` `b ) ( 2x – 3 )` $^{2}$ `= 9`

Toán Lớp 7: `a“)` `( 2x – 1 ) ` $^{3}$ `=` `8` `b ) ( 2x – 3 )` $^{2}$ `= 9`

Tháng Bảy 23, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a) ( 2x – 1 ) $^{3}$ = 8
b ) ( 2x – 3 ) $^{2}$ = 9

Comments ( 2 )

  1. thanoanghha
    thanoanghha
    23 Tháng Bảy, 2022 at 2:49 sáng
    Reply
    a)
    (2x-1)^3 = 8
    => (2x-1)^3=  2^3
    =>2x-1=2
    =>2x=3
    =>x=3/2
    Vậy x=3/2
    b)
    (2x-3)^2 =9
    => (2x-3)^2 =(+-3)^2
    =>2x-3=3 hoặc 2x-3=-3
    +)2x-3=3=>2x=6=>x=3
    +)2x-3=-3=>2x=0=>x=0
    Vậy x \in{3;0}
     

  2. haiyemy
    haiyemy
    23 Tháng Bảy, 2022 at 2:49 sáng
    Reply
    $\\$
    Bạn tham khảo bài.
    a,
    (2x-1)^3=8
    ⇒ (2x-1)^3=2^3
    ⇒2x-1=2
    ⇒2x=2+1
    ⇒2x=3
    ⇒x=3/2
    Vậy x=3/2
    b,
    (2x-3)^2=9
    ⇒ \(\left[ \begin{array}{l}(2x-3)^2=3^2\\(2x-3)^2=(-3)^2\end{array} \right.\) $\\$ => \(\left[ \begin{array}{l}2x-3=3\\2x-3=-3\end{array} \right.\) $\\$ => \(\left[ \begin{array}{l}2x=3+3\\2x=-3+3\end{array} \right.\) $\\$ => \(\left[ \begin{array}{l}2x=6\\2x=0\end{array} \right.\) $\\$ => \(\left[ \begin{array}{l}x=3\\x=0\end{array} \right.\) 
    Vậy x=3,x=0

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

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