Đáp án:
Giải thích các bước giải:
1) -1/12 + 5/-6 - 4/3
= -1/12 + -10/12 - 16/12
= -11/12 - 16/12
= -27/12
= -9/4
2) -3/16 - ( 3/8 - 5/4 )
= -3/16 - 3/8 + 5/4
= -3/16 - 6/16 + 20/16
= -9/16 + 20/16
= 11/16
3) 4/9 : -1/2 + 3/5 × (-2/3)²
= 4/9 : -2/1 + 3/5 × 4/9
= 8/9 + 4/15
= 40 + 12/45
= 62/15
4) 15 - ²1/3 : (4/9 - 1/6)
= 15 - 7/3 : 15/54
= 15 - 7/3 × 54/15
= 15 - 42/5
= 75 - 42/5
= 33/5
5) 0,5 × _/16 - _/49
= 1/2 × 4 - 7
= 2 - 7
= -5
6) -5 × _/9/16 + 4 × _/36/100 - 6 × _/0,09
= -5 × 3/4 + 4 × 3/5 - 6 × 3/10
= -15/4 + 12/5 - 9/5
= -75 + 48 - 36/20
= -63/20