Tính:
a) 25dam + 42dam
83hm – 75hm
13km ⨯ 5
b) 672m + 314m
475dm – 56dm
48cm : 6
a) 25dam + 42dam = 67dam
83hm – 75hm = 8hm
13km ⨯ 5 = 65km
b) 672m + 314m = 986m
475dm – 56dm = 419dm
48cm : 6 = 8cm
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