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a=x+3
h=x-3
P=(x+3)*(x-3)÷2
P=x²-3x+3x-9÷2
P=x²÷2-9÷2
P=(a+b)*h÷2
P=(x+x+2)*x+1÷2
P=(x²+x²+2x+x+x+2)÷2
P=(2x²+4x+2)÷2
P=x²+2x+1