Răspuns:
a) = (3·4+3)/4:[(1·4+3)/4:2/3-(1·4+3)/4·(1·8+1)/8]-5/7
=15/4:(7/4·3/2-7/4·9/8)-5/7
= 15/4:(⁴⁾21/8-63/32)-5/7
=15/4:(84/32-63/32)-5/7
=15/4:21/32-5/7
=15/4·32/21-5/7
=40/7-5/7
=35/7
_________________
b) [1/10+1/5:(⁴⁾2/3-³⁾1/4)]:2
=[1/10+1/5:(8/12-3/12)]:2
=(1/10+1/5:5/12):2
=(1/10+1/5·12/5):2
=(⁵⁾1/10+²⁾12/25):2
=(5/50+24/50):2
=29/50:2/1
=29/50·1/2
=29/100
