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2.30+30+20+20=100cm
2 x (30+20)=2 x 50=100cm
2 * 30 cm + 2 * 20 cm = 100 cm
2 * (30 cm + 20 cm)= 2 * 50 cm = 100 cm
* jako razy
20 + 20 + 30 +30= 100 cm
sposób II :
20× 2 + 30× 2 = 100 cm.
sposób III :
(20 + 30)× 2 = 50 ×2 = 100 cm