Đáp án + Giải thích các bước giải:
`a)` `(-4)/3-7/(-6)+1/2`
`=(-4)/3-(-7)/6+1/2`
`=(-8)/6-(-7)/6+3/6`
`=(-8+7+3)/6=2/6=1/3`
`b)` `8/7+4/7*(-6)/11-4/7*5/11`
`=8/7+4/7((-6)/11-5/11)`
`=8/7+4/7(-11/11)`
`=8/7+4/7(-1)=8/7-4/7=4/7`
`c)` `5 3/7-(4 3/7+1)`
`=5 3/7 - 4 3/7-1`
`=(5 3/7-4 3/7)-1`
`=[5+3/7-(4+3/7)]-1`
`=(5+3/7-4-3/7)-1`
`=1-1=0`
`d)` `1 5/15*0,75-(11/20+25%):3/5`
`=1 1/3*3/4-(11/20+1/4)*5/3`
`=4/3*3/4-(11/20+5/20)*5/3`
`=1-16/20*5/3`
`=1-16/4*1/3`
`=1-4*1/3`
`=1-4/3=-1/3`.
