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a) a5×b7×c×a9×b12×c15×abc=
b) x5×(-y)3×x7×x4×(-y)10×(-y)=
c) (n10÷n7)×(n12÷n8)÷(n15÷n9)=
d) a20÷[a15×(a13÷a9)÷(a2×a12)]=



Odpowiedź :

a) a5×b7×c×a9×b12×c15×abc=a15*b20*c17
b) x5×(-y)3×x7×x4×(-y)10×(-y)=x16*(-y)14
c) (n10÷n7)×(n12÷n8)÷(n15÷n9)=n
d) a20÷[a15×(a13÷a9)÷(a2×a12)]=a15
Magda

Odpowiedź:

[tex]a)\ \ a^5*b^7*c*a^9*b^1^2*c^1^5*abc=a^1^5b^2^0c^1^7\\\\\\b)\ \ x^5*(-y)^3*x^7*x^4*(-y)^1^0*(-y)=x^5*(-y)^3*x^7*x^4*y^1^0*(-y)=\\\\=x^1^6y^1^4\\\\\\c)\ \ (n^1^0:n^7)*(n^1^2:n^8):(n^1^5:n^9)=(n^{10-7})*(n^{12-8}):(n^{15-9})=\\\\=n^3*n^4:n^6=n^{3+4-6}=n^1=n\\\\\\d)\ \ a^2^0:[a^1^5*(a^1^3:a^9):(a^2*a^1^2)]=a^2^0:[a^1^5*(a^{13-9}):(a^{2+12})=\\\\=a^2^0:(a^1^5*a^4:a^1^4)=a^2^0:(a^{15+4-14})=a^2^0:a^5=a^{20-5}=a^1^5[/tex]