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可千If x-1-8, find the values of (a)x21(b) x4 12fx + 1 -3, find the values of (a) x2 +,,9 If a +2b-5, and ab 2, find a2 +4b2la hfr2+9y2=9 and xy=1, find (2x+6y)211_1rr _ y = 12 and xy =6 , find x + y.(b) x4 +42

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