g(x)=x⁵-2x⁴+x²-5x+3
h(x)=x⁴-3x²+2x-5
a, f(x)+g(x) b, f(x)-h(x)
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2 câu trả lời 482
a,
f(x)+g(x)=(x5-4x3+x2-2x+1)+(x5-2x4+x2-5x+3)
=x5-4x3+x2-2x+1+x5-2x4+x2-5x+3
=(x5+x5)-2x4-4x3+(x2+x2)+(-2x-5x)+(1+3)
=2x5-2x4-4x3+2x2-7x+4
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f(x)-h(x)=(x5-4x3+x2-2x+1)-(x4-3x2+2x-5)
=x5-4x3+x2-2x+1-x4+3x2-2x+5
=x5-x4-4x3+(x2+3x2)+(-2x-2x)+(1+5)
=x5-x4-4x3+4x2-4x+6
a.
#f(x) + g(x) = (x⁵ - 4x³ + x² - 2x+ 1)+(x⁵ - 2x⁴ + x² - 5x +3)
f(x) + g(x) = x⁵ - 4x³ + x² - 2x + 1 + x⁵ - 2x⁴ + x² - 5x + 3
f(x) + g(x) = (x⁵ + x⁵) + ( -4x⁴ - 2x⁴) + ( x² + x²) + ( -2x - 5x) + ( 1 +3 )
f(x) + g(x) = 2x⁵ - 6x⁴ + 2x² + 3x + 4
#f(x) - h(x) = ( x⁵ - 4x³ + x² - 2x + 1)- (x⁴ - 3x²+ 2x - 5)
f(x) - h(x) = x⁵ - 4x³ + x² - 2x +1 - x⁴ + 3x² - 2x + 5
f(x) - h(x) = x⁵ - x⁴ - 4x³ + (x² + 3x² ) + ( 2x - 2x) + ( 1 + 5 )
f(x) - h(x) = x⁵ - x⁴ - 4x³ + 4x² + 6
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