Odpowiedzi

2010-04-11T19:31:43+02:00
2(5x² +4) + (2x-3)(2x+3)- 2(3x²- 1)+ 3(1- 2x²) =
=10x²+8+ 4x²-3²-6x²+2+3-6x²=
=8-9+2+3+2x²=4+2×¼=4+½=4½
2010-04-11T19:35:32+02:00
2(5x² +4) + (2x-3)(2x+3)- 2(3x²- 1)+ 3(1- 2x²)
2(5*1/4+4)+(1-3)(1+3)-2(3*1/4 - 1) +3(1-2*1/4)
2(5,25)+(-2)(4) - 2(-0,25)+1,5
10,5-8+0,5+1,5=4,5
2010-04-11T19:37:32+02:00
2(5x² +4) + (2x-3)(2x+3)-2(3x²- 1)+ 3(1- 2x²)=
=2[5*(½)²+4]+4x²-9-6x²+2+3-6x²=
=2(5*0,25+4)+8x²-4=
=10,5+8x²-4=
=8x²+6,5