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

Toán Lớp 9: 3 √2x+1/7 √98x- √72x+4=0 tìm x

Tháng Sáu 1, 2022 Toán học 1 Comment 0 views

Toán Lớp 9: 3 √2x+1/7 √98x- √72x+4=0
tìm x

Comments ( 1 )

  1. baoquyen
    baoquyen
    1 Tháng Sáu, 2022 at 1:26 chiều
    Reply
    $\text{3$\sqrt{2x}+$$\dfrac{1}{7}$$\sqrt{98x}-$$\sqrt{72x}+4=0$}$
    ⇔ $\text{ 3$\sqrt{2x}+$$\dfrac{1}{7}.7\sqrt{2x}-$6$\sqrt{2x}$+4=0}$
    ⇔$\text{3$\sqrt{2x}+\sqrt{2x}-6\sqrt{2x}+4=0$}$
    ⇔$\text{4-$2\sqrt{2x}$=0}$
    ⇔$\text{2(2-$\sqrt{2x})$=0}$
    ⇔$\text{2-$\sqrt{2x}$=0}$
    ⇔$\text{$\sqrt{2x}$=2}$
    ⇔$\text{$(\sqrt{2x}$)²=4}$
    ⇔$\text{2x=4}$
    ⇔$\text{x=2}$

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

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