Question

pentru 2 kg de piersici si 3kg de cirese, mama a platit 32 de lei pentru a face gem es a cumparat 4 kg de piersici si 5 de cirese de acelasi fel si a platit 56 de lei. cat a costat un kg de piersici? Dar unul de cirese?

Answer 1

Notam :
kg de piersici=kgp
kg de caise=kgc

2kgp+3kgc=32
4kgp+5kgc=56

4kgp+5kgc-2kgp+3kgc=56-32
4kgp-2kgp+5kgc-3kgc=24
2kgp+2kgc=24

1 kg de cirese:
2kgp+3kgc-2kgp+2kgc=32-24
3kgc-2kgc+2kgp-2kgp=8
1 kg cirese=8

1 kg de piersici:
2kgp+2kgc=24
2kgp+2×8=24
2kgp=24-16
2kgp=8
kgp=8/2
kgp=4

Answer 2

2kg piersici------------------3kg cirese------------------32 lei l x2
4kg piersici------------------5 kg cirese-----------------56lei

4kg piersici-----------------6kg cirese------------------64 lei
4kg piersici- -------------- 5kg cirese-----------------56 lei


6-5=1kg cirese
64-56=8 lei (un kg de cirese)

5x8=40 lei (5kg cirese)
56-40=16 lei (4kg piersici)
16:4=4 lei (un kg de piersici)