Nội dung bài giảng
Bài 59. Làm tính chia
a) \({5^3}:{( - 5)^2}\);
b) \(\left ( \frac{3}{4} \right )^{5}\): \(\left ( \frac{3}{4} \right )^{3}\)
c) \({( - 12)^3}:{8^3}\).
Bài giải:
a) \({5^3}:{( - 5)^2} = {5^3}:{5^2} = {5^{3 - 2}} = 5\)
b) \(\left ( \frac{3}{4} \right )^{5}\): \(\left ( \frac{3}{4} \right )^{3}\)= \(\left ( \frac{3}{4} \right )^{5 -3}\)= \(\left ( \frac{3}{4} \right )^{2}\) = \(\frac{9}{16}\)
c) \({( - 12)^3}:{8^3} = {\left( { - {{12} \over 8}} \right)^3} = {\left( { - {3 \over 2}} \right)^3} = - {{27} \over 8}\)