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a*b=2540
a*(b-100)=1540
a=?
b=?


Răspuns :

a×b= 2540
a×(b-100)= 1540

a×b-a×100= 1540
2540-100a= 1540
100a= 2540-1540
100a= 1000
a= 1000:100
a= 10

a×b= 2540
10b= 2540
b= 2540:10
b= 254
100+1540=1640
1640-1540=100(A)
100:2=50