Toán Lớp 9: Tìm x biết 2√x + √16x – √25x – 5 =0
Tìm x biết 2√x + √9x + √16x – 18 = 0
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Toán Lớp 9: Tìm x biết 2√x + √16x – √25x – 5 =0
Tìm x biết 2√x + √9x + √16x – 18 = 0
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Giải đáp:
2√x + √16x – √25x – 5=0
<=>2√x + 4√x – 5√x = 5
<=> √x = 5
<=> x = 25
Vậy S = {25}
2√x + √9x + √16x – 18=0
<=>2√x + 3√x + 4√x =18
<=> 9√x = 18
<=>√x = 2
<=> x = 4
Vậy S = {4}