a. $\frac{4}{9}+\frac{2}{3}x$ = ($\frac{4}{9}+\frac{2}{3}$)x = $\frac{10}{9}x$
b. $-12y^{2}+0,7y^{2}$ = ($-12+0,7) y^{2}$ = $-11,3y^{2}$
c. $-21t^{3}-25t^{3}$ = $(-21-25) t^{3}$ = $-46t^{3}$
a. $\frac{4}{9}+\frac{2}{3}x$ = ($\frac{4}{9}+\frac{2}{3}$)x = $\frac{10}{9}x$
b. $-12y^{2}+0,7y^{2}$ = ($-12+0,7) y^{2}$ = $-11,3y^{2}$
c. $-21t^{3}-25t^{3}$ = $(-21-25) t^{3}$ = $-46t^{3}$