Question

5b+8a-5b²b при а=8, b=40

Answer 1

$5b+8a- frac{5 b^{2} }{b}=5b+8a- frac{5*b*b}{b}=5b-5b+8a=8a; a=8, 8a=64$

Answer 2

5b+8a-5b^2:b=5b:1+8a-5b^2:b=5b^2:b+8a-5b^2=5b+8a-5b:b=8a:b=64:40=1.6