Question

2 supra 3 + 3 supra 4 + 7 supra 10 ; 7 supra 8 - (1 supra 2 - 1 supra 4)

Answer 1

a) 2/3 + 3/4 + 7/10 : amplifici 2/3 cu 40, 3/4 cu 30 si 7/10 cu 12
80/120+90/120+84/120=254/120

b)7/8-(1/2-1/4) = 7/8 - (2/4 -1/4) = 7/8 -1/4= 7/8-2/8=5/8

1. amplifici 1/2 cu 2 (2/4)
2. amplifici 1/4 cu 2 (2/8)