2 x 3,12 x 1,25 : 0,25 x 10
= 6,24 x 1,25 x 4 x 10
= 6,24 x 5 x 10
= 6,24 x 50
= 312
12,48 : 0,5 x 6,25 x 4 x 2
= 12,48 x 2 + ( 6,25 x 4 ) x 2
= 12,48 x ( 2 x 2 ) x 25
= 12,48 x ( 4 x 25 )
= 12,48 x 100
= 1248
2 x 3,12 x 1,25 : 0,25 x 10
= 2 x 3,12 x 1,25 x 4 x 10
= 2 x 3,12 x 5 x 10
= ( 2 x 5 ) x 10 x 3,12
= 100 x 3,12
= 312