Bài 5A:
a: Ta có: \(M=\left(2x+y\right)^2-\left(y-2x\right)^2\)
\(=\left(2x+y-y+2x\right)\left(2x+y+y-2x\right)\)
\(=4x\cdot2y=8xy\)
b: Ta có: \(N=\left(3x+2\right)^2+2\left(3x+2\right)\left(1-2y\right)+\left(2y-1\right)^2\)
\(=\left(3x+2+1-2y\right)^2\)
\(=\left(3x-2y+3\right)^2\)
c: Ta có: \(P=\left(x^2+2xy\right)^2+2\left(x^2+2xy\right)y^2+y^4\)
\(=\left(x^2+2xy+y^2\right)^2\)
\(=\left(x+y\right)^4\)
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