Question

Pentru a confectiona 4 bluze si 3 rochii un croitor are nevoie de 20,75m.... va rog ajutatima urgent

Answer 1

4B +3R=20,75m
3B+2R=14,25 m
Inmultim ambele ecuatii cu 100 si avem:
400B+300R=2075
300B+200R=1425 => R=(1425-300B)/200
300R=(300/200)x(1425-300B)= (3x1425-900B)/2 = (4275-900B)/2
400B+300R=400B+(4275-900B)2=2075 ; Amplificam termenul unu si ultimul cu doi si => 800B-900B=4150-4275=-125
100B=125 ; B=125/100=1,25m
R=(1425-300x1,25)/200=(1425-375)/200=1050/200=5,25m
Bluze=1,25m
Rochii=5,25m