U5=7,U7=343 U3=.. tolong ya yang jenius matematika

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U5=7,U7=343 U3=.. tolong ya yang jenius matematika

frac{u7}{u5} = frac{a {r}^{6} }{ {a} {r}^{4} } = frac{343}{7} \ {r}^{2} = 49 \ a times {7}^{4 } = 7 \ a = {7}^{ - 3}
u3 = a {r}^{2} = {7}^{ - 3} times {7}^{2} = {7 }^{ - 1} = frac{1}{7}