Đáp án:
`13,`
`75% - (5/2 + 5/3) + (-1/2)^2`
`= 3/4 - 25/6 + 1/4`
`= (3/4+ 1/4) - 25/6`
`= 1 - 25/6`
`= (-19)/6`
`14,`
`120% - 3/14 - (6/5 - 2 3/14)`
`= 6/5 - 3/14 + (6/5 - 31/14)`
`= 6/5 - 3/14 - 6/5 + 31/14`
`= (6/5 - 6/5) + (-3/14 + 31/14)`
`=0 + 2`
`= 2`
`15,`
`1/3 + 1 3/4 - (1 3/4 - 80%)`
`= 1/3 + 1 3/4 - 1 3/4 + 80%`
`= (1/3 + 80%) + (1 3/4 - 1 3/4)`
`= 17/15 + 0`
`= 17/15`
`16,`
`(-10)/11 × 4/7 + (-10)/11 × 3/7 + 1 10/11`
`= (-10)/11 × (4/7 + 3/7) + 21/11`
`= (-10)/11 × 1 + 21/11`
`= (-10)/11 + 21/11`
`= 1`
`17,`
`-80 - [48 + (4 - 12)^2] ÷ (-2)^3`
`= -80 - [48 + (-8)^2] ÷ (-8)`
`= -80 - [48 + 64] ÷ (-8)`
`= -80 -112 ÷ (-8)`
`= -80 - (-14)`
`= -66`
