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a=2cm,b=3cm,c=4cm
a)2ab/3cb=12/28=3/7
b)√3ac/√2b=√3*2*4/√2*3=2√6/√6 (trzeba usunąć niewymierność pierwiastka)
2√6/√6*√6/√6=2√36/6=12/6=2