. là nhân à!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!111111

x.17,2-x.12,2=2018

x.(17,2-12,2)=2018

x.5=2018

x=2018:5

x=403,6

1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256

= 128+64+32+16+8+4+2+1/256

=(128+32)+(64+16)+(8+2)+(4+1)/256

=160+80+10+5/256

=255/256

​

\(B = \frac{7. 3^{16} . 2^{30} - 2^{34} . 3^{15}}{3^{21} . 2^{28} - 2^{28} . 3^{17}}\)

\(= \frac{3^{15} . 2^{30} . \left(\right. 7.3 - 2^{4} \left.\right)}{3^{17} . 2^{28} . \left(\right. 3^{4} - 1 \left.\right)} = \frac{2^{2} . \left(\right. 21 - 16 \left.\right)}{3^{2} . \left(\right. 81 - 1 \left.\right)} = \frac{2^{2} . 5}{3^{2} . 2^{4} . 5} = \frac{1}{3^{2} . 2^{2}} = \frac{1}{36}\)

a

A

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là Mai dễ mà .😀😀😀😀😀