若定义P☆Q=5P+3Q,P¤Q=3P-5Q,那么(3¤2/3)☆0.6=_.
问题描述:
若定义P☆Q=5P+3Q,P¤Q=3P-5Q,那么(3¤
)☆0.6=______. 2 3
答
(3¤
)☆0.6,2 3
=(3×3-5×
)☆0.6,2 3
=(9-
)☆0.6,10 3
=
☆0.6,17 3
=5×
+3×0.6,17 3
=
+85 3
,9 5
=
;452 15
故答案为:
.452 15