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4. Micşoraţi 20 km cu: a) 1/5din el; b) 30% din el; c) 25% din el; d) 2/3din el; e) 40% din el; f) 80% din el. ​

Răspuns :

Răspuns:

a) 1/5×20km= 4km=> 20-4=16km.

b) 30/100×20=6 km=> 20-6=14km.

c) 25/100×20= 5km=> 20-5=15km.

d) 2/3×20= 40/3 km= 13.3 km=> 20-13.3= 6.7km.

e)40/100×20= 8 km=> 20-8= 12km.

f) 80/100×20= 16 km=> 20-16=4km.