Question

11．已知計算規(guī)則$|\begin{array}{l}{a}&\\{c}&yz5grds\end{array}|$=ad-bc，則$|\begin{array}{l}{-4}&{-2}\\{3}&{-1}\end{array}|$=10．

Answer 1

分析 根據(jù)計算規(guī)則$|\begin{array}{l}{a}&\\{c}&45qm9iw\end{array}|$=ad-bc，把$|\begin{array}{l}{-4}&{-2}\\{3}&{-1}\end{array}|$轉(zhuǎn)化成有理數(shù)的四則運算進行計算即可．

解答 解：∵$|\begin{array}{l}{a}&\\{c}&kpsilxw\end{array}|$=ad-bc，
∴$|\begin{array}{l}{-4}&{-2}\\{3}&{-1}\end{array}|$=（-4）（-1）-（-2）×3
=4+6
=10，
故答案為10．

點評 本題考查了有理數(shù)的混合運算，把一種新運算轉(zhuǎn)化成有理數(shù)的四則運算是解題的關(guān)鍵．