Question

Va rog ajutai-ma repede acord coroana

1.(2x-3)*(3x+1)+(5-2x)*(3x+1)=
2.(x+2)*(3-2x)+(4x+1)*(3-2x)+3-2x=
3. 5(4x-3)+(4x-3)*(2-3x)-(2x+5)*(4x-3)

Answer 1

1)2x•3x+2x•1-3•3x-3•1+5•3x+5•1-2x•3x-2x•1=
6x^2+2x-9x-3+15x+5-6^x^2-2x=
=6x+2

2)x•3+x•(-2x)+2•3+2•(-2x)+4x•3+4x•(-2x)+1•3+1•(-2x)+3-2x=
=3x-2x^2+6-4x+12x-8x^2+3-2x+3-2x
=-10x^2-7x+10

3)20x-15+4x•2+4x•(-3x)-3•2-3x•(-3)-[2x•4x+2x• (-3)+5•4x+5•(-3)]=
=20x-15+8x-12x^2-6+9x-8x^2+6x-20x+15=
=-20x^2+23x-6