[tex]\displaystyle 1)\sqrt{72*32}=\sqrt{2304}=48\\ \\2)\sqrt{1\frac{7}{9}*\frac{4}{25} }=\sqrt{\frac{16}{9}*\frac{4}{25} }=\frac{4}{3}*\frac{2}{5}=\frac{8}{15}\\ \\3)\sqrt{28*7}=\sqrt{196}=14[/tex]
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[tex]\displaystyle 1)\sqrt{72*32}=\sqrt{2304}=48\\ \\2)\sqrt{1\frac{7}{9}*\frac{4}{25} }=\sqrt{\frac{16}{9}*\frac{4}{25} }=\frac{4}{3}*\frac{2}{5}=\frac{8}{15}\\ \\3)\sqrt{28*7}=\sqrt{196}=14[/tex]