jeśli a/b = 3 to jaka jest wartość a2 + 4ab b2
a/b=3 /*b
a=3b
więc:
((3b)² +4*3b *b) /b²=
=(9b² + 12b²)/b² =
=b²(9+12)/b² =
=9+12=
=21
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a/b=3 /*b
a=3b
więc:
((3b)² +4*3b *b) /b²=
=(9b² + 12b²)/b² =
=b²(9+12)/b² =
=9+12=
=21