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Apr 16 at 14:44 comment added Rui T. sorry about that!!i thought the former scenario could be easily extended to the latter ,so i simplify the question incorrectly。sorry about wasting your time!
Apr 16 at 14:11 comment added poncho @RuiT. if that's the scenario you're interested in, you probably should mention it in your question...
Apr 16 at 13:49 comment added Rui T. thanks for your answer! Another questioin is if $a,b,c$ was extended to vectors $\vec{a},\vec{b},\vec{c}$,they need to compute $r\cdot (\vec{a}+\vec{b}+\vec{c})$。it seems doesn't work
Apr 16 at 13:34 history edited poncho CC BY-SA 4.0
added 166 characters in body
Apr 16 at 13:20 history answered poncho CC BY-SA 4.0