Odpowiedzi

2010-02-27T10:16:18+01:00
A)7(5a-b)-3(2a-3b)= 35a-7b-6a+9b = 29a+2b

B)4x(y-3)+5y(3-10x)+(2x+5)(6-3y) = 4xy-12x+15y-50xy+12x-6xy+30-15y = -52xy-30

C)-x²+(x²-x-7) = -x⁴+x³+7x²

D)(2a-3b)+(4a-b) = 2a-3b+4a-b =6a-4b

E)(a+b-c)-(2a-b+2c) = a+b-c-2a+b-2c = -a+2b-3c