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nguyenchiphong929
2 năm trước
Giúp mình với ạ! 86.Cho M(x)=3x^3-2x^2+3x-5;N(x)=-3x^3+2x^2-6x-1 a)Tính M(x)+N(x) b) tìm nghiệm của M(x)+N(x) 87.Cho M(x)=4x^3-2x^2+8x-1; N(x)=-4x^3+2x^2-10x+5 a) tính A(x)=M(x)+N(x) b) tìm nghiệm của A(x) Câu 2: Cho hai đa thức sau: M(x)=x^2-3x+2x^3-25 N(x)= 2x^3+x^2-13+3x a/Tính A(x)=M(x)+N(x), rồi tìm bậc của đa thức A(x) b/ Tìm đa thức B(x) biết M(x)=-B(x)+N(x) Kiểm tra xem x=-2 có phải là nghiệm của đa thức B(x) không? Bài 2: Cho hai đa thức: A(x)=-2+x^2+5x^4+2x^3 B(x)=1-5x^4-2x^3-x+x^2 a) Tính P(x)=A(x) và Q(x)=B(x)-A(x) b) Tính P(-1) Bài 2: Cho đơn thức: A=-2/3x^2y(-1/2xy^3).3/4xy a) thu gọn đơn thức A b) tính giá trị của đơn thức A tại x=2, y=-1 c) hay cho ba đơn thức đồng dạng với đơn thức A rồi tính tổng của ba đơn thức vừa cho
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