C(x)-D(x)=(x4-3x+12x3-x5+2)-(4x2+6x4-3-x5)C(x)−D(x)=(x4−3x+12x3−x5+2)−(4x2+6x4−3−x5)
=x4-3x+12x3-x5+2-4x2-6x4+3+x5=x4−3x+12x3−x5+2−4x2−6x4+3+x5
=(x5-x5)+(x4-6x4)+12x3-4x2-3x+3+2=(x5−x5)+(x4−6x4)+12x3−4x2−3x+3+2
=0+(-5x4)+12x3-4x2-3x+3+2=0+(−5x4)+12x3−4x2−3x+3+2
=-5x4+12x3-4x2-3x+5=−5x4+12x3−4x2−3x+5
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C(x)-D(x)=(x4-3x+12x3-x5+2)-(4x2+6x4-3-x5)C(x)−D(x)=(x4−3x+12x3−x5+2)−(4x2+6x4−3−x5)
234
2523
349
đề :)