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21.35-3.25.7
= 21.35-21.25
= 21.(35-25)
= 21. 10
=210
77 - 11.( 30+7)
= 11.7 -11.30 -11.7
= 11.7-11.7 -11.30
= -11.30
= -330
21.35-3.25.7=210
77-11(30+7)=-330
85(35-27)-35(85-27)=-1350
47(45-15)-47(45+15)=-2820
![](https://rs.olm.vn/images/avt/0.png?1311)
85(35-27)-35(85-27)=85.35-85.27-35.85+35.27
=(85.35-35.85)+(35.27-85.27)
=0+27.(35-85)
=27.(-40)
=-1080
85(35-27)-35(85-27)
= 85.35-85.27-35.85-35.27
=(85.35-35.85)+(35.27-85.27)
=0+27.(35-85)
=27.(-40)
= 1080
![](https://rs.olm.vn/images/avt/0.png?1311)
(-27).35-35.38+35.(-45)+35.10
=(-27).35+35.(-38)+35.(-45)+35.10
=35.[-27+(-38)+(-45)+10]
=35.(-100)
=-3500
![](https://rs.olm.vn/images/avt/0.png?1311)
85.(35-27)-35.(85-27)
=85.35-85.27-35.85-35.27
=27.(-85-35)
=-3240
![](https://rs.olm.vn/images/avt/0.png?1311)
a,
85.(35-27)-35.(85-27)
=85.35-85.27-35.85-35.27
=85.35-35.85-85.27.35.27
=85.27-35.27
=(85-35).27
=100.27/2
=2700/2
=1350
![](https://rs.olm.vn/images/avt/0.png?1311)
(42-69+17)-(42+17)
=42-69+17+(-42)-17
=[42+(-42)]+[17+(-17)]-69
=0+0-69
=0-69
=-69
Bài làm
a) ( 42 - 69 + 17 ) - ( 42 - 17 )
= 42 - 69 + 17 - 42 + 17
= 42 - 69 - 42 + 34
= 34 - 69
= -35
b) 85 x ( 35 - 27 ) - 35 x ( 85 - 27 )
= 85 x 35 - 85 x 27 - 35 x 85 + 35 x 27
= ( 85 x 35 - 35 x 85 ) - ( 85 x 27 + 35 x 27 )
= 0 - [ 27 x ( 85 + 35 ) ]
= 0 - [ 27 x 120 ]
= 0 - 3240
= -3240
# Học tốt #
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(-\left(76-35+15\right)+\left[18-27+\left(-17\right)\right]\)
\(=-76+35+15+18-27-17\)
\(=-52\)
b) \(167+\left[127-235-\left(-16\right)\right]+\left(-67\right)\)
\(=167+127-235+16-67\)
\(=8\)
c) \(\left(-19\right)+165-\left[27+\left(-21\right)-\left(+72\right)\right]\)
\(=\left(-19\right)+165-27+21+72\)
\(=212\)
d) \(89.\left(-2\right)+\left[20+\left(-2\right).\left(-5\right)-85\right]\)
\(=\left(-178\right)+\left(20+10-85\right)\)
\(=\left(-178\right)+20+10-85\)
\(=-233\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 21.35-3.25.7=21.35-21.25=21.(35-25)=21.10=210
b, 77-11.(30+7)=77-330-77=-330
c, 85.(35-27)-35.(85-27)=85.35-85.27-35.85+35.27=0
d, 47.(45-15)-47.(45+15)=47.45-47.15-47.45-47.15=-2(47.15)=1410
a, 21.35-3.25.7=21.35-21.25=21.10=210
b,77-11.(30+7)=77-11.30-11.7=-11.30=-330
c,85.(35-27)-35.(85-27)=85.35-85.27-85.35+35.27=27.(-50)=-1350
d, 47.(45-15)-47.(45+15)=47.45-47.15-47.45-47.15=-47.30=-1410
hình như bằng 0
hok tốt
85.[35-27]-35.[85-27]
=85.35-85.27-35.85+35.27
=85.27+35.27
=27(85+35)
=27.120
=3240