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$7.$ Jika $\dfrac {\sqrt{2} -\sqrt{3} } {\sqrt{2} +\sqrt{3} }.=a+b\sqrt{6}$ a dan b bilangan bulat, maka nilai dari $a+b$ adalah .. a. $-5$ d. $2$ b. $-3$ e. $3$ C. $-3$ $8.$ Bentuk sederhana dari $\sqrt{11-\sqrt{120} }$ adalah ... a. $\sqrt{6} -\sqrt{5}$ b. $\sqrt{6} +\sqrt{5}$ c. $\sqrt{11} -\sqrt{5}$ d. $\sqrt{11} +\sqrt{5}$ e. $\sqrt{15} -\sqrt{8}$
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