Jon P. answered 02/26/15
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1: 6x7/3x4: First divide 6 by 3, to get 2. Then divide x7 by x4 to get x3. So the answer is 2x3.
2: You mean (3√125)4? 3√125 is the cube root of 125, which is 5. So the expression means 54 which is equal to 625.