Wykonaj mnożenie i zredkuj wyrazy podobne.
a) (x+1)(x²-x+1)
b) (s-2)(s³-s²+s-1)
c) (ab+1)(a+b+ab+1)
*d) (m+nm+n²)(m²+nm+n)
e) (3x-1)[(2x+2)-(x+3)]
f) (x+3)(x-1)
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a)
(x+1)(x²-x+1) = x³-x²+x+x²-x+1=x³+1
b)
(s-2)(s³-s²+s-1) = s⁴-s³+s²-s-2s³+2s²-2s+2 = s⁴-3s³+3s²-3s+2
c)
(ab+1)(a+b+ab+1) = a²b+ab²+a²b²+ab+a+b+ab+1 = a²b+ab²+a²b²+2ab+a+b+1
*d) (m+nm+n²)(m²+nm+n)=m³+nm²+mn+nm³+n²m²+n²m+n²m²+n³m+n³=m³=
m³+nm²+mn+nm³+2n²m²+n²m+n³m+n³
e) (3x-1)[(2x+2)-(x+3)]==(3x-1)(2x+2-x-3)=6x²+6x-3x²-9x-2x+x+3=
3x²-4x+1
) (x+3)(x-1)=x²-x+3x-3=x²+2x-3
licze na naj.