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

Toán Lớp 7: ($\frac{15}{8}$ – $\frac{1}{8}$) : ($\frac{x}{4}$ – 0,5) = $\sqrt{1\frac{9}{16}}$ cần gấp khó quá ko nghĩ ra =))

Toán Lớp 7: ($\frac{15}{8}$ – $\frac{1}{8}$) : ($\frac{x}{4}$ – 0,5) = $\sqrt{1\frac{9}{16}}$
cần gấp khó quá ko nghĩ ra =))

Comments ( 2 )

  1. Answer
    (15/8 – 1/8) : (x/4 – 0,5) = \sqrt{1 9/16}
    => 7/4 : (x/4 – 1/2) = \sqrt{25/16}
    => 7/4 : (x/4 – 1/2) = 5/4
    => (x/4 – 1/2) = 7/4 : 5/4
    => x/4 – 1/2 = 7/5
    => x/4 = 7/5 + 1/2
    => x/4 = 19/10
    => 10x = 19 . 4
    => 10x = 76
    => x = 76 : 10
    => x = 38/5
    $\text{Vậy}$ x = 38/5

  2. (15/8-1/8):(x/4-0,5)=\sqrt{1 9/16}
    ->(15/8-1/8):(x/4-1/2)=\sqrt{25/16}
    ->((15-1)/8):(x/4-1/2)=(\sqrt{25})/(\sqrt{16})
    ->14/8:(x/4-1/2)=(\sqrt{5^2})/(\sqrt[4^2})
    ->7/4:(x/4-1/2)=(|5|)/(|4|)
    ->7/4:(x/4-1/2)=5/4
    ->x/4-1/2=7/4:5/4
    ->x/4-1/2=7/4 . 4/5
    ->x/4-1/2=(7.4)/(4.5)
    ->x/4-1/2=28/20
    ->x/4-1/2=7/5
    ->x/4=7/5+1/2
    ->x/4=14/10+5/10
    ->x/4=(14+5)/10
    ->x/4=19/10
    ->x.10=19.4
    ->10x=76
    ->x=76:10
    ->x=76/10
    ->x=38/5
    Vậy x=38/5
     

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

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