Разложите на множители :
1) 2a+7xb-2b-7xa
2)a^2-b^2-6a+6b
3)x^2-2x^4+5x^3
1) 2a+7xb-2b-7xa
2)a^2-b^2-6a+6b
3)x^2-2x^4+5x^3
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Answers & Comments
2) = ( a - b )( a + b ) - 6( a - b ) = ( a - b )( a + b - 6 )
3) = x^2( 1 - 2x^2 + 5x )