a) 24 : 6 : 2 = 4 : 2 = 2 => Đ

b) 24 : 6 : 2 = 24 : 3 = 8 => S

c) 18 : 3 x 2 = 18 : 6 = 3 => S

d) 18 : 3 x 2 = 6 x 2 = 12 => Đ

18 : 3 x 2 = 6 x 2 = 12 => Đ

24 : 6 : 2 = 24 : 3 = 8 => S

18 : 3 x 2 = 18 : 6 = 3 => S

\(4\frac{2}{7}.3=\left(4+\frac{2}{7}\right).3=4.3+\frac{2}{7}.3=12+\frac{6}{7}=12\frac{6}{7}\)

Cách này nhanh hơn nhiều đúng không

\(\left(2x-2\right)^2-\left(2x-1\right)^2=0\)

\(\Leftrightarrow\left[\left(2x-2\right)-\left(2x-1\right)\right]\cdot\left[\left(2x-2\right)+\left(2x-1\right)\right]=0\)

\(\Leftrightarrow\left(2x-2-2x+1\right)\cdot\left(2x-2+2x-1\right)=0\)

\(\Leftrightarrow\left(2x-2x-2+1\right)\cdot\left(2x+2x-2-1\right)=0\)

\(\Leftrightarrow\left(-1\right)\cdot\left(4x-3\right)=0\)

\(\Leftrightarrow4x-3=0\div\left(-1\right)\)

\(\Leftrightarrow4x-3=0\)

\(\Leftrightarrow4x=3\)

\(\Leftrightarrow x=\frac{3}{4}\)

 Vậy \(x=\frac{3}{4}\)

\(\left(2x-2\right)^2-\left(2x-1\right)^2=0\)

\(\left[2x-2-\left(2x-1\right)\right]\left[2x-2+\left(2x-1\right)\right]=0\)

\(\left(2x-2-2x+1\right)\left(2x-2+2x-1\right)=0\)

\(-1\left(4x-3\right)=0\)

\(-4x+3=0\)

\(-4x=-3\)

\(x=\frac{3}{4}\)