数学之美团为你解答√128 - √18= √64*√2 - √9*√2= 8√2 - 3√2= 5√2[15√(1/5)] ² = (15² /5) = 45(√128 - √18)² = (5√2)² = 5045 < 50∴ 15√(1/5) < √128 - √18...