$\text{Bài 1:}$
`a)60%-4 1/2+2/3`
`=3/5-9/2+2/3`
`=18 /30-135/30+20/30`
`=-97/30`
`b)-4/11.-7/9+ -4/9. 2/11-7/11`
`=[4.7]/11.9+[4.(-2)]/11.9-7/11`
`=4/11 . 7/9+4/11 . -2/9-7/11`
`=4/11(7/9-2/9)-7/11`
`=4/11. 5/9-7/11`
`=20/99-7/11`
`=20/99-63/99`
`=-43/99`
`c)3/5:-7/10+0,5-(-9/14)`
`=3/5.-10/7+1/2+9/14`
`=-6/7+1/2+9/14`
`=-12/14+7/14+9/14`
`=2/7`
`d)3/5-8/5:(5,25+75%)`
`=3/5-8/5:(5,25+0,75)`
`=3/5-8/5:6`
`=3/5-8/5. 1/6`
`=3/5-4/15`
`=9/15-4/15`
`=1/3`
`e)7/11. 3/4+7/4. 1/11+4/11`
`=7/11. 3/4+[1.7]/4.11+4/11`
`=7/11. 3/4+7/11. 1/4+4/11`
`=7/11(3/3+1/4)+4/11`
`=7/11. 1+4/11`
`=7/11+4/11`
`=1`