Wykonaj mnożenie i zredaguj wyrazy podobne : a) (x+1)(x+2)= b) (3a+4)(a-5)= c) (2t+1)(1-3t)= d) (3ab-7)(3-7ab)= e) (x-y)(5x+6y)= f) (x+5y)(7x-y)= Plis zróbcie na dziś !!!

a) (x+1)(x+2)= x²+2x+x+2=x²3x+2 b) (3a+4)(a-5)=3a²-15a+4a-20=3a²-11a-20 c) (2t+1)(1-3t)=2t-5t²+1-3t=-t-5t²+1 d) (3ab-7)(3-7ab)=6ab-21ab²-21+49ab=50ab-21ab²-21 e) (x-y)(5x+6y)=5x²+6xy-5xy-6y²=5x²+xy-6y² f) (x+5y)(7x-y)=7x²-xy+35xy-5y²=7x²+34xy-5y² Proszę ;)

a) (x+1)(x+2)=x²+2x+x+2=x²+3x+2 b) (3a+4)(a-5)=3a²-15a+4a-20=3a²-11a-20 c)(2t+1)(1-3t)=2t-6t²+1-3t=-t-6t²+1 d) (3ab-7)(3-7ab)=9ab-21a²b²-21+49ab=58ab-21a²b²-21 e) (x-y)(5x+6y)=5x²+6yx-5yx-6y²=5x²+xy-6y² f) (x+5y)(7x-y)=7x²-xy+35xy-5y²= 7x²+34xy-5y²