Given the line AB = 18cm, point C is the point on line ab. according to the following conditions, find the length of AC and BC: (1) C is the midpoint of AB; (2) AC is twice of BC (3) AC: BC = 3:2; (4) AC is 4cm more than BC

1.AC=9cm,BC=9cm
2.AC=12cm,BC=6cm
3.AC=10.8cm,BC=7.2cm
4.AC=11cm,BC=7cm

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