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

Toán Lớp 6: a, 1498 – 98.2x = 126 b, 175:5x +240=245 c, (x-5) x (2x-16)=0

Toán Lớp 6: a, 1498 – 98.2x = 126
b, 175:5x +240=245
c, (x-5) x (2x-16)=0

Comments ( 2 )

  1. a,*Ta có:1498 – 98.2x = 126
    =>98.2x=1498-126
    =>98.2x=1372
    =>2x=1372:98
    =>2x=14
    =>x=7
    b,175:5x +240=245
    =>175:5x=245-240
    =>175:5x=5
    =>5x=175:5
    =>5x=35
    =>x=7
    c,(x-5) x (2x-16)=0
    =>x-5=0 hoặc 2x-16=0
    =>x=5 hoặc 2x=16
    =>x=5 hoặc x=8
     

  2. a, 1498-98.2x=126
    ⇒98.2x=1498-126
    ⇒196x=1372
    ⇒x=7
    b, 175:5x +240=245
    ⇒175:5x=5
    ⇒5x=35
    ⇒x=7
    c, (x-5) × (2x-16)=0
    ⇒ \(\left[ \begin{array}{l}x-5=0\\2x-16=0\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x=5\\x=8\end{array} \right.\) 
    Vậy x=5 hoặc x=8.

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

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