\(\sqrt{x}=a;a>0\Leftrightarrow A=a^3-3a^2+4a-2\)
\(\Leftrightarrow A=\left(a^3-3a^2+3a-1\right)+\left(a-1\right)\)
\(\Leftrightarrow A=\left(a-1\right)^3+\left(a-1\right)\)
\(A=\left(a-1\right)\left[\left(a-1\right)^2+1\right]\)
\(A=\left(\sqrt{x}-1\right)\left(x-2\sqrt{x}+2\right)\)
Phan tich da thuc sau thanh nhan tu : (x+1)(x+2)(x+3)(x+4)-8
phan tich da thuc thanh nhan tu
3(x4+x2+1)-(x2+x+1)2
phan tich da thuc thanh nhan tu
a)x4+x2+x+1
b)11x4+4x2-5
phan tich da thuc thanh nhan tu:
x^2-xy-2y^2
phan tich da thuc thanh nhan tu
\(\left(x^2-y^2+1\right)^3-x^6-y^6-1\)
phan tich cac da thuc sau thanh nhan tu :
a,x\(^2\)y\(^3\)-\(\dfrac{1}{2}\)x\(^4\)y\(^8\)
Phân tich da thuc thanh nhan tu :
X^2-2xy+y^2+2x-2y
Bài 2 : rút gon
X^3+2x2y+xy^2 phần ( k viết dau gach ngang dc)x^2-y^2
a)\(\sqrt{x+1}+\sqrt{4-x}=5-\sqrt{\left(x+1\right)\left(4-x\right)}\)
b)\(x+\sqrt{4-x^2}=2+3x\sqrt{4-x^2}\)
c)\(\sqrt{x^2+x+4}+\sqrt{x^2+x+1}=\sqrt{2x^2+2x+9}\)
d)\(\sqrt{x}+\sqrt{x-\sqrt{1-x}}=1\)
e)\(\sqrt{x^2+2\sqrt{x-1}}-\sqrt{x-2\sqrt{x-1}}=2\)
bài 1: tìm x, biết:
a)\(\)\(\sqrt{x}\)=7 c) \(\sqrt{3x+\frac{1}{2}}\)-\(\frac{3}{2}\)=0 e) \(\sqrt{x+1}\)=11
b)\(\sqrt{x-3}\)=13 d) \(\sqrt{3x+4}\)=5
