Răspuns:
a)
a×b= 5/4×2/5= 1/2
7/8×b = 7/10
b= 7/10÷ 7/8
b= 7/10× 8/7
b= 1/5× 4/1= 4/5
proba÷ 7/8× 4/5= 14/ 20= 7/10
a× 3/2= 5/6
a= 5/6÷ 3/2
a= 5/6 × 2/3
a= 5/9
proba÷ 5/9× 3/2= 5/3×1/2=5/6
b)
a÷b = 5/4÷ 2/5
a÷b= 5/4× 5/2
a÷b= 25/8
7/8÷b= 7/10
b= 7/10× 7/8
b= 49/80
