Question

Tinh nhanh\(\frac{3}{4}X\frac{7}{9}+\frac{3}{4}X\frac{2}{9}\)

Answer 1

\(\frac{3}{4}\cdot\frac{7}{9}+\frac{3}{4}\cdot\frac{2}{9}=\left(\frac{7}{9}+\frac{2}{9}\right)\frac{3}{4}=1\cdot\frac{3}{4}=\frac{3}{4}\)

Answer 2

3/4.7/9+3/4.2/9=3/4.(7/9+2/9)=3/4.1=3/4

Answer 3

\(=\frac{3}{4}X\left(\frac{7}{9}+\frac{2}{9}\right)\)

\(=\frac{3}{4}X1\)

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

Answer 4

3/4*7/9+3/4*2/9

=3/4*(7/9+2/9)

=3/4*1

=3/4