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Văn Cường
4 tháng trước

câu 1:A)tìm x biết:5√(4x-8) -2√9x-18=0

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Thanh Thuy
4 tháng trước

Đáp án:

 

Giải thích các bước giải:

 

nhatkt2007
4 tháng trước

Đáp án: `x = 2`

Giải thích các bước giải:

`5\sqrt{4x-8} - 2\sqrt{9x - 18} = 0`

`<=> 5\sqrt{4(x-2)} - 2\sqrt{9(x - 2)} = 0`

`<=> 10\sqrt{x-2} - 6\sqrt{x - 2} = 0`

`<=> 4\sqrt{x-2} = 0`

`<=> \sqrt{x-2} = 0`

`<=> x - 2 = 0`

`<=> x = 2`

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