a) 5x(2-x)+(4x-1)(3+2x)-(x-1)(2+x)
b) -3x(2x+7)-(x-3)(4-x)+(2-3x)(3+2x)
a) 5x(2-x)+(4x-1)(3+2x)-(x-1)(2+x)=
10x-5x²+12x+8x-3+2x-(2x+x²-2+x)= opuszczamy nawias
10x-5x²+12x+8x-3-2x-x²+2-x= redukujemy
-6x²+25x-1
b) -3x(2x+7)-(x-3)(4-x)+(2-3x)(3+2x)=
-6x²-21x-(4x-x²-12-3x)+6+4x-9x-6x²= opuszczamy nawias
-6x²-21x-4x+x²+12+3x+6+4x-9x-6x²= redukujemy
-11x²-27x+18
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a) 5x(2-x)+(4x-1)(3+2x)-(x-1)(2+x)=
10x-5x²+12x+8x-3+2x-(2x+x²-2+x)= opuszczamy nawias
10x-5x²+12x+8x-3-2x-x²+2-x= redukujemy
-6x²+25x-1
b) -3x(2x+7)-(x-3)(4-x)+(2-3x)(3+2x)=
-6x²-21x-(4x-x²-12-3x)+6+4x-9x-6x²= opuszczamy nawias
-6x²-21x-4x+x²+12+3x+6+4x-9x-6x²= redukujemy
-11x²-27x+18