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14) 2x += 6 and 2x-1--1,then 4x2-_?ЗУ3y29y2

Answer»

(a+b)(a-b)=a^2-b^2(2x+1/3y)(2x-1/3y)=4x^2-1/9y^26(-1/2)=4x^2-1/9y^24x^2-1/9y^2=-3



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