Đáp án:
\(\begin{align}
& a){{m}_{A}}={{m}_{C}}=5kg;{{m}_{D}}=1,25kg \\
& b){{P}_{A}}=4{{P}_{D}} \\
\end{align}\)
Giải thích các bước giải:
Ta có:
\(\left\{ \begin{align}
& {{m}_{A}}={{m}_{B}}={{m}_{C}} \\
& {{m}_{C}}=4{{m}_{D}} \\
\end{align} \right.\)
\(\Rightarrow {{m}_{A}}={{m}_{B}}={{m}_{C}}=4{{m}_{D}}\)
a) mA=5kg
\(\begin{align}
& {{m}_{A}}={{m}_{B}}={{m}_{C}}=5kg \\
& {{m}_{D}}=\dfrac{{{m}_{A}}}{4}=\dfrac{5}{4}=1,25kg \\
\end{align}\)
b) ta có trọng lượng:
\(P=m.10\)
mà:
\({{m}_{A}}=4{{m}_{D}}\Rightarrow {{P}_{A}}=4{{P}_{D}}\)
