Cho \(B = ( - 8 ).25.( - 3)^2 \) và \(C = ( - 30)...

C

- Hướng dẫn giải

 \(\begin{array}{l} B = \left( { - 8} \right).25.{\left( { - 3} \right)^2} = - 200.9 = - 1800\\ \begin{array}{*{20}{l}} {C = \left( { - 30} \right).{{\left( { - 2} \right)}^3}.\left( {{5^3}} \right)}\\ { = \left( { - 30} \right).\left( { - 8} \right).125}\\ { = \left( { - 30} \right).\left( { - 1000} \right)}\\ { = 30000} \end{array} \end{array}\)

Khi đó:

B.50=−1800.50=−90000;

C.(−3)=30000.(−3)=−90000

Vậy \(B.50=C.(−3)\)