8.300cm -- 650dm + 12dam=.........m

8.300 cm = 83 m
650 dm = 65 m
12 dam = 120 m

83 - 65 + 120 = 18 + 120 = 138

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Jawaban :

8.300 cm = 8.300/100 = 83 m
650 dm = 650/10 = 65 m
12 dam = 12 × 10 = 120 m

Maka ;

8.300 cm - 650 dm + 12 dam
83 m - 65 m + 120 m
138 m