3 cm × 5 – 7 cm …… 2 cm × 9 – 8 cm
9 kg × 3 + 34 kg ……. 6 kg × 3 + 5 kg
4l × 5 – 8l ……. 8l × 5 – 28 l
7 dm × 3 - 8 dm …….. 9 dm × 4 – 17 dm
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