Question

Giải phương trình:

a) \(\sqrt{x-1}-\sqrt[3]{2-x}=5\)

b) \(x^2+\sqrt{x+5}=5\)

Answer 1

ơ xin lỗi toán 9 nhé!

@ngonhuminh

Answer 2

\(a.x\ge1;\left\{{}\begin{matrix}a=\sqrt{x-1}\\b=\sqrt[3]{2-x}\end{matrix}\right.\)

\(\left\{{}\begin{matrix}a-b=5\\a^2+b^3=-1\end{matrix}\right.\)

\(\left(5+b\right)^2+b^3=-1\)\(\Leftrightarrow b^3+b^2+10b+24=0\Leftrightarrow\left(b+2\right)\left(b^2-b+12\right)=0\)

\(b=-2\Rightarrow x=10\)