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`a)5/9:(1/11-5/22)+5/9:(1/15-2/3)`
`=5/9:(2/22-5/22)+5/9:(1/15-10/15)`
`=5/9:(-3)/22+5/9:(-9)/15`
`=5/9*(-22)/3+5/9*(-5)/3`
`=5/9*(-22/3+(-5)/3)`
`=5/9*(-9)=-5`
![](https://rs.olm.vn/images/avt/0.png?1311)
(-8/9 + 7/5 - 2/11) - (-2/5 - 17/9 - 13/11)
= -8/9 + 7/5 - 2/11 + 2/5 + 17/9 + 13/11
= (-8/9 + 17/9) + (7/5 + 2/5) + (-2/11 + 13/11)
= 1 + 9/5 + 1
= 19/5
(-8/9 +7/5 - 2/11) - (-2/5-17/9-13/11)
=-8/9 +7/5 - 2/11 +2/5 +17/9 +13/11
=(-8/9 + 17/9) +(7/5+2/5) (-2/11+13/11)
=11/9 + 9/5 + 1
= 55/45 + 81/45 +45/45
=181/45
![](https://rs.olm.vn/images/avt/0.png?1311)
`1/3-5/6+3/2`
`=2/6-5/6+9/6`
`=-3/6+9/6`
`=6/6`
`=1`
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`2/13-(15/13+4-0,5)`
`=2/13-1513-4+0,5`
`=(2/13-15/13)-4,5`
`=-13/13-4,5`
`=-1-4,5`
`=-5,5`
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`-(1/9+7/5-3/11)+(-2/5+17/9-8/11)`
`=-1/9-7/5+3/11+(-2)/5+17/9-8/11`
`=(-1/9+17/9)+(-7/5+(-2)/5)+(3/11-8/11)`
`=16/9-9/5-5/11`
`=-236/495`
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`5,75-3,25+5 5/6`
`=5/2+35/6`
`=15/6+35/6`
`=50/6`
`=25/3`
![](https://rs.olm.vn/images/avt/0.png?1311)
a) `1/9-0,3. 5/9+1/3`
`=1/9-3/10 . 5/9+1/3`
`=1/9-15/90+1/3`
`=1/9-1/6+1/3`
`=2/18-3/18+6/18`
`=5/18`
b) `(-2/3)^2+1/6-(-0,5)^3`
`=4/9+1/6-(-0,125)`
`=4/9+1/6+0,125`
`=4/9+1/6+1/8`
`=32/72+12/72+9/72`
`=53/72`
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{2}{3}-4.\left(\frac{1}{2}+\frac{3}{4}\right)\)
= \(\frac{2}{3}-4.\frac{5}{4}\)
= \(\frac{2}{3}-5\)
= \(-\frac{13}{3}\).
b) Câu này là 117 hay \(\frac{11}{7}\) vậy bạn?
Chúc bạn học tốt!