b, \(\frac{x+2}{2}=\frac{2x-3}{5}\)

\(\Rightarrow(x+2)5=2\left(2x-3\right)\)

\(\Leftrightarrow5x+2.5=\left(2.2x\right)-2.3\)

\(\Leftrightarrow5x+10=4x-6\)

\(\Leftrightarrow5x-4x=-10-6\)

\(\Leftrightarrow\left(5-4\right)x=-16\)

\(\Leftrightarrow x=-16\)

\(V\text{ậy}x=-16\)

Tại sao động vật không có khả năng tự dưỡng?

TL

Vì thức ăn của động vật là thịt động vật, nó phải đi tìm mồi, săn mồi thì mới có thịt ăn

HT

vì ????????????????????????????????????????????????????????????????

TL

= 5/2-563/165-4/3+1/3(1/2+1/2-7/2)

=5/2-563/165-4/3+1/3.-5/2=-508/165

Hok tốt

\(2\frac{1}{2}-3,4\left(12\right)-\frac{4}{3}+\frac{1}{3}\left(\frac{1}{2}+0,5-3\frac{1}{2}\right)\)

\(=\frac{5}{2}-\left(\frac{17}{5}+\frac{2}{165}\right)-\frac{4}{3}-\frac{5}{6}\)

\(=\frac{5}{2}-\frac{17}{5}-\frac{2}{165}-\frac{4}{3}-\frac{5}{6}=-\frac{508}{165}\)

1.SKATING

2. PLAYING

3. COLLECTING

3. I really love  (skate) skating in the park with my friends.

4. He dislik.e (play) playing board games because he loses all the time.

5. My friend, Lily, is interested in  (collect)collecting  plas bottles to recycle.

\(2\frac{1}{2}.3,4\left(12\right)-\frac{4}{3}+\frac{1}{3}.\left(\frac{1}{2}+0,5-3\frac{1}{2}\right)\)

\(=\frac{5}{2}.\frac{563}{33}-\frac{4}{3}+\frac{1}{3}.\left(\frac{1}{2}+\frac{1}{2}-\frac{7}{2}\right)\)

\(=\frac{2815}{66}-\frac{4}{3}+\frac{1}{3}.\frac{-5}{2}\)

\(=\frac{909}{22}+\frac{-5}{6}\)\(=453\frac{2}{3}\)

\(2\frac{1}{2}.3,4\left(12\right)-\frac{4}{3}+\frac{1}{3}\left(\frac{1}{2}+0,5-3\frac{1}{2}\right)\)

= \(\frac{5}{2}.\left(3,4+\frac{2}{165}\right)-\frac{4}{3}+\frac{1}{3}\left(-\frac{5}{2}\right)\)

= \(\frac{5}{2}\left(\frac{17}{5}+\frac{2}{165}\right)-\frac{4}{3}-\frac{5}{6}\)

\(=\frac{17}{2}+\frac{1}{33}-\frac{4}{3}-\frac{5}{6}\)

\(=\frac{561}{66}+\frac{2}{66}-\frac{88}{66}-\frac{55}{66}=\frac{70}{11}\)