①(3x²-2)-(4x²-2x-3)+(2x²-1)②3(a²-2ab)-(-ab+b²)

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①(3x²-2)-(4x²-2x-3)+(2x²-1)②3(a²-2ab)-(-ab+b²)①(3x²-2)-(4x²-2x-3)

①(3x²-2)-(4x²-2x-3)+(2x²-1)②3(a²-2ab)-(-ab+b²)
①(3x²-2)-(4x²-2x-3)+(2x²-1)
②3(a²-2ab)-(-ab+b²)

①(3x²-2)-(4x²-2x-3)+(2x²-1)②3(a²-2ab)-(-ab+b²)
①(3x²-2)-(4x²-2x-3)+(2x²-1)
=3x²-2-4x^2+2x+3+2x^2-1
=(3x^2-4x^2+2x^2)+2x+(3-2-1)
=x^2+2x
②3(a²-2ab)-(-ab+b²)
=3a^2-6ab+ab-b^2
=3a^2-5ab-b^2

①(3x²-2)-(4x²-2x-3)+(2x²-1)
=3x²-2-4x^2+2x+3+2x^2-1
=(3x^2-4x^2+2x^2)+2x+(3-2-1)
=x^2+2x
②3(a²-2ab)-(-ab+b²)
=3a^2-6ab+ab-b^2
=3a^2-5ab-b^2