展开 (a-b)x^2+(a+b)x+c+(e-i)x^2+(e+i)x+o

解答

展开

(a - b) x^{2} + (a + b) x + c + (e - i) x^{2} + (e + i) x + o

a x^{2} - b x^{2} + a x + b x + c + e x^{2} - i x^{2} + e x + i x + o

求解步骤

(a - b) x^{2} + (a + b) x + c + (e - i) x^{2} + (e + i) x + o

= x^{2} (a - b) + x (a + b) + c + x^{2} (e - i) + x (e + i) + o

乘开

x^{2} (a - b) : a x^{2} - b x^{2}

= a x^{2} - b x^{2} + (a + b) x + c + (e - i) x^{2} + (e + i) x + o

乘开

x (a + b) : a x + b x

= a x^{2} - b x^{2} + a x + b x + c + (e - i) x^{2} + (e + i) x + o

乘开

x^{2} (e - i) : e x^{2} - i x^{2}

= a x^{2} - b x^{2} + a x + b x + c + e x^{2} - i x^{2} + (e + i) x + o

乘开

x (e + i) : e x + i x

= a x^{2} - b x^{2} + a x + b x + c + e x^{2} - i x^{2} + e x + i x + o

e x p an d 3 sin (7 (x + 3)) + 4

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