Đáp án:
Giải thích các bước giải:
a) 3 17/24 + 2 8/15 + 1 7/8
= 3 + 17/24 + 2 + 8/15 + 1 + 7/8
= (3 + 2 + 1)+(17/24 + 8/15 + 7/8)
= 6+( 85/120 +64/120 +105/120)
= 6 + 254/120
= 6 + 127/60
= 360/60 + 127/60
= 487/60
b) 4 19/ 2 + 2 8/ 15
= 4 + 19/2 + 2 + 8/15
= ( 4 + 2) + ( 19/2 + 8/15)
= 6 + ( 285/30 + 16/30)
= 6 + 301/30
= 180/30 + 301/30
= 481/30
c) 4 3/4 + 3 11/30
= 4 + 3/4 + 3+ 11 / 30
= ( 4 + 3) + (3/4 + 11/ 30)
= 7 + ( 45/60 + 22/60)
= 7 + 67/60
= 420/60 + 67/60
= 487/60
