Tôi đou phải siêu nhân:>

Bài này là Listening cơ mà đoạn nghe đou nhỉ?

\(b,3^x=\dfrac{9^4}{81^3}\\ \Rightarrow3^x=\dfrac{3^8}{3^{12}}\\ \Rightarrow3^x=3^{-4}\\ \Rightarrow x=-4.\)

\(\dfrac{25^3.2^{10}}{16^2.625^2}=\dfrac{25^3.2^{10}}{2^8.25^2}=\dfrac{25.2^2}{1}=25.4=100.\)

\(a,\dfrac{2}{3}x-\dfrac{2}{5}=\dfrac{1}{2}x-\dfrac{1}{3}\\ \Rightarrow\dfrac{2}{3}x-\dfrac{1}{2}x-\dfrac{2}{5}=-\dfrac{1}{3}\\ \Rightarrow x\left(\dfrac{2}{3}-\dfrac{1}{2}\right)-\dfrac{2}{5}=-\dfrac{1}{3}\\ \Rightarrow x\dfrac{1}{6}=-\dfrac{11}{15}\\ \Rightarrow x=-\dfrac{22}{5}\\ b,\dfrac{1}{3}x+\dfrac{2}{5}.\left(x+1\right)=0\\ \Rightarrow\dfrac{1}{3}x+\left(x+1\right)=-\dfrac{2}{5}\\ \Rightarrow\dfrac{1}{3}x=-\dfrac{2}{5}-\left(x+1\right)\\ \Rightarrow\dfrac{1}{3}x=-\dfrac{7}{5}-x\\ \Rightarrow\dfrac{1}{3}.2x=-\dfrac{7}{5}\\ \Rightarrow2x=-\dfrac{21}{5}\\ \Rightarrow x=-\dfrac{21}{10}.\)

I like collecting grass bottles.

\(a,Ư\left(199\right)=\left\{1;199\right\}\\ B,Ư\left(625\right)=\left\{1;5;25;625\right\}\\ c,Ư\left(200\right)=\left\{1;2;4;5;8;10;20;25;40;50;100;200\right\}\)

Muốn tham gia lắm cơ mà ko khéo tay:>>>

\(x\times2+x\times\dfrac{1}{5}=1.\dfrac{1}{3}\\ \Rightarrow x\times\left(2+\dfrac{1}{5}\right)=\dfrac{1}{3}\\ \Rightarrow x\times\dfrac{11}{5}=\dfrac{1}{3}\\ \Rightarrow x=\dfrac{5}{33}\)

Giai lại:

 Đổi: 180 tấn = 180000000g

Cá voi ở Nam Cực gấp số lần chim Họa Mi ở Hy Lạp là:

       \(180000000:30=60000000\) ( lần )

                        Đ/S:....