Question

a) dacă 0,3a=0,5b atunci calculați a/b si b/a
b) 7a=(5+4²)b , calculati a/b si b/a
c) 1/2⁴•a=72b² , determinați a²/b² si a/b
d) dacă 0,5a² , determinați a²/b² si a/b

Answer 1

A).0,3a=0,5b
a/b = 0.5/0.3=5/10:3/10=5/10 x10/3=1.(6)
b/a=0.3/0.5=3/10:5/10=3/10x10/5=3/5=0.6
b) 7a=(5+4²)b
a/b =(5+4²)/7=(5+16)/7=21/7=3
b/a=7/(5+4²)=7/(5+16)=7/21=1/3=0.(3)
c) 1/2⁴•a²=72b²
1/16xa² =72b²
a²/16=72b²
a²/b²=72x16=1172
a/b = radical (72 x16)=24 radical(2)