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p² + r²
b)
5*(u-v)²=5*[(u-v)*(u-v)]=5*(u²-uv-uv+v²)=5u²-5uv-5uv+5v²=
=5u²-10uv+5v²
b) 5[(u-v)²]=5[u²-2uv+v²]=5u²-10uv+5v²