15) b) in cm²
7,45m²-4,52dm²+72,5cm²=74500cm²-452cm²+72,5cm²=74120,5cm²
37,1m²-21,57dm²-1234mm²=371000cm²-2157cm²-12,34cm²=368830,66cm²
12,5dm²-0,0135m²+0,01201dam²=1250cm²-35cm²+12010cm²=13225cm²
12456mm²+0,123m²+172dm²=124,56cm²+1230cm²+17200cm²=18554,56cm²
