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to 4a+6b kreska ułamkowa 2a wynosi ?
7a-5b/b=7
7a/b -5=7
7a/b= 12
a/b =12/7→b/a=7/12
4a+6b/2a=?
4a+6b/2a=4a/2a+6b/2a=2 + 3*b/a=2 + 3 * 7/12=2 + 21/12 = 24+21/12=45/12
=3 i 3/4