Đáp án:
Giải thích các bước giải:
`a) 5/6+3/2-1/12`
`= 7/3-1/12=9/4`
`b)11/2.7/3- 11/2. 4/5`
`= 11/2 (7/3-4/5)`
`=11/2.23/15=253/30`
`c) (1/2)^2 + |-13/8| - (11/12)^0 `
`=1/4 + 13/8 + 1`
`=15/8 + 1`
`=23/8`
`2`
`a) x-5/4=7/2`
`x=7/2+5/4=19/4`
`b)|x+2/3| = 5/8`
`1: x+2/3=5/8`
`x=5/8-2/3 =-1/24`
`2:x+2/3=-5/8`
` x=(-5/8)-2/3 =-31/24`
