`#3107.101107`
`a)`1
`-8/19 * 16/31 + (-8)/19 * 15/31 - 11/19`
`= -8/19 * (16/31 + 15/31) - 11/19`
`= -8/19 * 1 - 11/19`
`= -8/19 - 11/19`
`= -19/19 = -1`
`b)`
`\sqrt{(-5)^2} * (-1/5)^2 \div [((-1)/3)^2 + \sqrt{1/4} - \sqrt{16/9}]`
`= 5 * 1/25 \div (1/9 + 1/2 - 4/3)`
`= 1/5 \div (-13/18)`
`= -18/65`
`c)`
`\sqrt{121} - \sqrt{225} + \sqrt{25/4}`
`= \sqrt{11^2} - \sqrt{15^2} + \sqrt{(5/2)^2}`
`= 11 - 15 + 5/2`
`= 5/2 - 4`
`= -3/2`
`d)`
`|-11/3| + (-1/2)^2 - |4 1/2 + (-3,25)|`
`= 11/3 + 1/4 - (4 1/2 - 3,25)`
`= 131/3 + 1/4 - 4 1/2 + 3,25`
`= 47/12 - 4 1/2 + 3,25`
`= -7/12 + 3,25`
`= 8/3`
Đúng 3
Bình luận (2)