1.3(a²-2ab)-(-ab+b²) 2.-2(2x²-x+4)+3(x²-2x+3)

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1.3(a²-2ab)-(-ab+b²) 2.-2(2x²-x+4)+3(x²-2x+3)
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1.3(a²-2ab)-(-ab+b²) 2.-2(2x²-x+4)+3(x²-2x+3)
1.3(a²-2ab)-(-ab+b²) 2.-2(2x²-x+4)+3(x²-2x+3)

1.3(a²-2ab)-(-ab+b²) 2.-2(2x²-x+4)+3(x²-2x+3)
一、3(a²-2ab)-(-ab+b²)
=3a²-6ab+ab-b²
=3a²-5ab-b²
二、 -2(2x²-x+4)+3(x²-2x+3)
=-4x²+2x-8+3x²-6x+9
=-x²-4x+1

1. 3(a²-2ab)-(-ab+b²)
=3a²-6ab+ab-b²
=3a²-5ab-b²
2. -2(2x²-x+4)+3(x²-2x+3)
=-4x²+2x-8+3x²-6x+9
=-x²-4x+1

1 3(a^2-2ab)-(-ab+b^2)
=3a^2-6ab+ab-b^2
=3a^2-5ab-b^2
2 -2(2x^2-x+4)+3(x^2-2x+3)
=-4x^2+2x-8+3x^2-6x+9
=-x^2-4x+1