Question

[ (1/2+2/3+5/6):7/12-2/5•5/6]•1/4:(5•12/25-1intreg și 1/3

Answer 1

[ ( 1/2 + 2/3 + 5/6 ) : 7/12 - 2/5 × 5/6 ] × 1/4 : ( 5 × 12/25 - 4/3) = 
= [ ( 3/6 + 4/6 + 5/6 ) : 7/12 - 1/3 ] × 1/4 : ( 12/5 - 4/3 ) = 
= ( 12/6 × 12/7 - 1/3 ) × 1/4 : ( 36/15 - 20/15 ) = 
= ( 24/7 - 1/3) × 1/4 : 16/15 = 
= ( 72/21 - 7/21 ) × 1/4 × 15/16 = 
= 65/21 × 1/4 × 15/16 = 
= 325 / 448=  0,725