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nguyenphuongthaongoc26012004
2 năm trước
Cho hai da thức: A(x)=2xngũ2+ 3x-4xngũ3 +4+5xngũ4: B(x) = 3xngũ4+1-7xngũ2+5xngũ3-9x:A) hãy sắp xếp các hạng tử của mỗi đa thức trên theo luỹ thừa giảm đần của biến?:B tính giá trị biểu thức A(x)tại x=-1;x=0,5:C tính A(x) + B(x) và A(x)-B(x)?
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