red+( )=purple white+black=( ) red+( )=( )

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red+()=purplewhite+black=()red+()=()red+()=purplewhite+black=()red+()=()red+()=purplewhite+black=()r

red+( )=purple white+black=( ) red+( )=( )
red+( )=purple white+black=( ) red+( )=( )

red+( )=purple white+black=( ) red+( )=( )
blue红加蓝成紫色
green yellow绿加红和黄成灰
gray白加黑成灰色