median
don steward
mathematics teaching 10 ~ 16

Thursday, 30 June 2016

radiating expressions (1)

the centre expression can only be changed by one of the four allowable steps at each stage, to (eventually) reach the outer expressions

there should not be any repeated expressions anywhere in the solution

a tactic is to work from the outside in, remembering to invert the operations...





what are the four allowable operations?






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