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21dm + 37cm= xmm
1dm = 100mm
1cm = 10mm
21(100mm) + 37(10mm)
2,100mm + 370mm
2,470mm
B.
700dm + 0,4km = xdam
1dm = 0.01dam
1km = 100dam
700(0.01dam) + 0.4(100dam)
7dam + 40dam
47dam