Question 1

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Donat el punt  A: open square brackets 3 comma 1 comma 0 close square brackets i la recta r colon open curly brackets table attributes columnalign left end attributes row cell x plus z minus 3 equals 0 end cell row cell 2 times x plus y plus 2 times z minus 1 equals 0 end cell end table close ,

La distància entre el punt i la recta és:

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