1. Rút gọn biểu thức
a, $\sqrt[3]{27}$ + $\sqrt[3]{8}$ - $\sqrt[3]{125}$;
b, $\sqrt[3]{-1000}$ + $\sqrt[3]{54}$ - $\sqrt[3]{128}$;
c, $\sqrt[3]{0,5}$.$\sqrt[3]{1,25}$.$\sqrt[3]{1,6}$;
d, $\frac{\sqrt[3]{135}}{\sqrt[3]{5}}+\sqrt[3]{108}.\sqrt[3]{2}$
Bài Làm:
a, $\sqrt[3]{27}$ + $\sqrt[3]{8}$ - $\sqrt[3]{125}$ = 3 + 2 + 5 = 10
b, $\sqrt[3]{-1000}$ + $\sqrt[3]{54}$ - $\sqrt[3]{128}$ = -10 + $\sqrt[3]{27.2}$ - $\sqrt[3]{64.2}$ = -10 + 3.$\sqrt[3]{2}$ - 4$\sqrt[3]{2}$ = -10 - $\sqrt[3]{2}$
c, $\sqrt[3]{0,5}$.$\sqrt[3]{1,25}$.$\sqrt[3]{1,6}$ = $\sqrt[3]{\frac{1}{2}}$.$\sqrt[3]{\frac{5}{4}}$.$\sqrt[3]{\frac{8}{5}}$ = $\sqrt[3]{\frac{1}{2}.\frac{5}{4}.\frac{8}{5}}$ = $\sqrt[3]{1}$ = 1
d, $\frac{\sqrt[3]{135}}{\sqrt[3]{5}}+\sqrt[3]{108}.\sqrt[3]{2}$ = $\sqrt[3]{\frac{135}{5}}$ + $\sqrt[3]{108.2}$ = $\sqrt[3]{27}$ + $\sqrt[3]{216}$ = 3 + 6 = 9