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377 Afla numerele necunoscute. a) a x 30 = 1 500; 2 500: a = 50; b) 80 × b = 2 400; b: 400 = 70; c) c: 80 = 400; 27 000 : c = 9.​

Răspuns :

a) a×30=1500

a=1500:30

a=50

2500:a=50

a=2500:50

a=50

b) 80×b=2400

b=2400:80

b=30

b:400=70

b=400×70

b=28000

c) c:80=400

c=400×80

c=32000

27000:c=9

c=27000:9

c=3000