Question

a) Daca 5a =6b , calculati a supra b
b) Daca a+b =1 si 2a / 5 = 3b/7 .. va rog faceti cu produsul mezilor= produsul extremilor

Answer 1

5a=6b deci a/b=6/5

2a/5=3b/7
2ax7=3bx5
14a=15b
a=1-b
14(1-b)=15b
14-14b=15b
14=14b+15b
14=29b
b=14/29
a=1-b=1-(14/29)=15/29