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![](https://rs.olm.vn/images/avt/0.png?1311)
= 13 + 5 - 13 - 25
= 13 -13 + 5 - 25
= 0 + 5 - 25
= 5 - 25
= -20
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left[219+\left(-299\right)\right]+12.5\)
= \(\left(-80\right)+60\)
= \(-20\)
Hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{29\cdot18-29\cdot7}{28\cdot33+33}=\frac{29\cdot\left(18-7\right)}{\left(28+1\right)\cdot33}=\frac{29\cdot11}{29\cdot33}=\frac{11}{33}=\frac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 67.(-18) + (-33).18
= 67.(-18) + 33.(-18)
= (-18).(67 + 33)
= (-18).100
= (-1800)
b) 34.(-53) - (-66).53 - 68.(-53)
= (-34).53 + 66.53 - (-68).53
= (-34).53 + 66.53 + 68.53
= 53. (-34 + 66 + 68)
= 53.100
= 5300
a) 67.(-18) + (-33).18
= 67.(-18) + 33.(-18)
= (-18).(67 + 33)
= (-18).100
= (-1800)
b) 34.(-53) - (-66).53 - 68.(-53)
= (-34).53 + 66.53 - (-68).53
= (-34).53 + 66.53 + 68.53
= 53. (-34 + 66 + 68)
= 53.100
= 5300
chúc bạn học tốt nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{35 + (–47) – |–12|}\)
\(=-12-12\)
\(=-24\)
\(\text{(–15) – 70 : (–14) + (–32) . (–2)}\)
\(=-15+5+64\)
\(=-10+64\)
\(=54\)
\(\text{ 15 – 12 . (-3)^2 – 135 : |–15|}\)
\(=15-12.9-135:15\)
\(=15-108-9\)
\(=-102\)
Tính hợp lý:
\(\text{ –24 . 78 + 24(–35) – 24(–13)}\)
\(=24.\left(-78+\left(-35\right)-\left(-13\right)\right)\)
\(=24.\left(-100\right)\)
\(=-2400\)
học tốt
47.52 + 47.49 - 47
= 47( 52 + 49 - 1 )
= 47.100
= 4700
47.52+47.49-47
=47.(52+49-1)
=47x100
=4700
nha
k mk nha