Răspuns:
15. a) 2400m²+3625m²+275m²=366175m²
32625m²- 7200m²= 25425m²
92,3m²+27,6325m²+4800m²=4919,9325m²
2,75m²-0,3225m²=2,4275m²
b) 74500cm²-452cm² +72,5cm²=74120,5cm²
370100cm²-2157cm²-12,34cm²=367930,66cm²
1250cm²-135cm²+12010cm²=13125cm²
124,56cm²+1260cm²+1,72cm²=1356,28cm²
16. a) 2,5m²+97,5m²=1 dam²( pt. că 1 dam²= 100m² )
b) 48 dm²+52 dm²= 1 m² ( 1 m²= 100 dm²)
c) 27 dam²+73 dam²= 1 hm² ( 1 hm²= 100dam²)
d) 625 cm²+9375 cm²= 1 m² ( 1m²=10000cm²)
e) 318 m²+277 m²+9405 m²= 1 hm² (1hm²= 10000 m²)
f) 21 dm² = 2100cm²⇒2100 cm²+450 cm²+ 7450 cm²=1 m²( 1 m²= 10000 cm²)
Explicație pas cu pas:
