![{ - x}^{4} \times { - y}^{4} \div {2}^{ - 4} \times {3}^{ - 4} = {2}^{4} \times {3}^{4} \times \sqrt[4]{5} \div ( { - x}^{ - 3})( { - y}^{ - 3}) \: and \: {x}^{4} + 1 \div {y}^{4} = 125 \div 216 \: and \: 1 \div x + 1 \div y = a \div b \: \: then \: find \: a - b](https://tex.z-dn.net/?f=+%7B+-+x%7D%5E%7B4%7D++%5Ctimes++%7B+-+y%7D%5E%7B4%7D+%5Cdiv++%7B2%7D%5E%7B+-+4%7D++++%5Ctimes++%7B3%7D%5E%7B+-+4%7D++%3D++%7B2%7D%5E%7B4%7D++%5Ctimes++%7B3%7D%5E%7B4%7D++%5Ctimes++%5Csqrt%5B4%5D%7B5%7D++%5Cdiv+%28+%7B+-+x%7D%5E%7B+-+3%7D%29%28+%7B+-+y%7D%5E%7B+-+3%7D%29+%5C%3A+and+%5C%3A++%7Bx%7D%5E%7B4%7D++%2B+1+%5Cdiv++%7By%7D%5E%7B4%7D+++%3D+125+%5Cdiv+216+%5C%3A+and+%5C%3A+1+%5Cdiv+x+%2B+1+%5Cdiv+y+%3D+a+%5Cdiv+b+%5C%3A++%5C%3A+then+%5C%3A+find+%5C%3A+a+-+b "{ - x}^{4} \times { - y}^{4} \div {2}^{ - 4} \times {3}^{ - 4} = {2}^{4} \times {3}^{4} \times \sqrt[4]{5} \div ( { - x}^{ - 3})( { - y}^{ - 3}) \: and \: {x}^{4} + 1 \div {y}^{4} = 125 \div 216 \: and \: 1 \div x + 1 \div y = a \div b \: \: then \: find \: a - b")
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