Объяснение:
[tex] \sqrt{81a} - \frac{1}{4} \sqrt{16a} = 9 \sqrt{a} - \frac{1}{4} \times 4 \sqrt{a} = 9 \sqrt{a} - \sqrt{a} = 8 \sqrt{a} [/tex]
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Объяснение:
[tex] \sqrt{81a} - \frac{1}{4} \sqrt{16a} = 9 \sqrt{a} - \frac{1}{4} \times 4 \sqrt{a} = 9 \sqrt{a} - \sqrt{a} = 8 \sqrt{a} [/tex]