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b)(9+x)(9+x)=81+9x+9x+x²=81+18x+x²
d)(x+6y)(x+6y)=x²+6xy+6xy+36y²=x²+12xy+36y²
e)(2x-5y)(2x-5y)=4x²-10xy-10xy+25y²=4x²-20xy+25y²
Myślę że będzie dobrze :)