计算:(5x^2-4x+1)-(2x^2-5x+7)
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计算:(5x^2-4x+1)-(2x^2-5x+7)计算:(5x^2-4x+1)-(2x^2-5x+7)计算:(5x^2-4x+1)-(2x^2-5x+7)=5x^2-4x+1-2x^2+5x-7=(
计算:(5x^2-4x+1)-(2x^2-5x+7)
计算:(5x^2-4x+1)-(2x^2-5x+7)
计算:(5x^2-4x+1)-(2x^2-5x+7)
=5x^2-4x+1-2x^2+5x-7
=(5x^2-2x^2)-(4x-5x)+(1-7)
=3X^2-(-X)+(-6)
=3X^2+X-6
3x²+x-6
=3X^2+X-6
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*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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