Rut gon
2 13 + 2 5 tren 2 10 + 2 2
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\(\frac{2^{13}+2^5}{2^{10}+2^2}=\frac{2^5\left(2^6+1\right)}{2^2\left(2^8+1\right)}=\frac{2^3.65}{257}=\frac{520}{257}\)
A = \(\dfrac{21^2.14.125}{35^5.6}\)
= \(\dfrac{\left(3.7\right)^2.\left(2.7\right).5^3}{\left(5.7\right)^5.\left(2.3\right)}\)
= \(\dfrac{3^2.7^2.2.7.5^3}{5^5.7^5.2.3}\)
= \(\dfrac{3^2.7^3.2.5^3}{5^5.7^5.2.3}\)
= \(\dfrac{3}{5^2.7^2}\)
= \(\dfrac{3}{35^2}\)
@Pham Thi Thu Trang
B = \(\dfrac{2^{10}.13+2^{10}.65}{2^8.104}\)
= \(\dfrac{2^{10}\left(13+65\right)}{2^8.104}\)
= \(\dfrac{2.78}{104}\)
= \(\dfrac{3}{2}\)
@Pham Thi Thu Trang
\(P\left(x\right)=5+x^3-2x+4x^3+3x^2-10=\left(x^3+4x^3\right)+3x^2+2x-\left(10-5\right)=5x^3+3x^2+2x-5\)
\(Q\left(x\right)=4-5x^3+2x^2-x^3+6x-11x^3-8x=-\left(5x^3+x^3+11x^3\right)+2x^2-\left(8x-6x\right)+4=-17x^3+2x^2-2x+4\)
\(P\left(x\right)-Q\left(x\right)=\left(5x^3+3x^2+2x-5\right)-\left(-17x^3+2x^2-2x+4\right)=5x^3+3x^2+2x-5+17x^3-2x^2+2x-4\)
\(=\left(5x^3+17x^3\right)+\left(3x^2-2x^2\right)+\left(2x+2x\right)-\left(5+4\right)=22x^3+x^2+4x-9\)
\(\frac{2^{10}.13+2^{10}.65}{2^8.104}\)
\(=\frac{2^{10}\left(13+65\right)}{2^8.104}\)
\(=\frac{2^2.78}{104}\)
tíc mình nha
\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)
\(=\frac{2^{19}.\left(3^3\right)^3+3.5.\left(2^2\right)^9.\left(3^2\right)^4}{\left(2.3\right)^9.2^{10}+\left(2^2.3\right)^{10}}\)
\(=\frac{2^{19}.3^9+3.5.2^{18}.3^8}{2^9.3^9.2^{10}+2^{20}.3^{10}}\)
\(=\frac{2^{19}.3^9+2^{19}.3^9.5}{2^{19}.3^9+2^{20}.3^{10}}\)
\(=\frac{2^{19}.3^9.\left(1+5\right)}{2^{19}.3^9\left(1+2.3\right)}\)
\(=\frac{6}{7}\)
Lời giải:
$(x-1)^3-(x-1)(x^2+x+1)=(x-1)[(x-1)^2-(x^2+x+1)]=(x-1)(x^2-2x+1-x^2-x-1)=(x-1)(-3x)=-3x(x-1)$
\(\frac{2^{13}+2^5}{2^{10}+2^2}=\frac{2^5.\left(2^8+1\right)}{2^2.\left(2^8+1\right)}=\frac{2^5}{2^2}=2^3\)