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![](https://rs.olm.vn/images/avt/0.png?1311)
a) 23.56 + 56.77 = (23 + 77).56 = 100.56 = 5600.
b) 32.19 + 32 = 32.(19 +1) = 32.20 = 640.
c) 35.34 + 35.86 + 65.75 + 65.45 = 35.(34 + 86) + 65.(75 + 45)
= 120.35+120.65 -120.(35 + 65) = 12000.
d) 43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)
= 43.30 + 57.30 = 30. (43+57) = 3000.
e) 3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400.
f) 64.16 + 81.84+17.16 = 16.(64+17)+81.84 = 16.81+81.84
= 81.(16 + 84) = 8100
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 23.56 + 56.77 = (23 + 77).56 = 100.56 = 5600.
b) 32.19 + 32 = 32.(19 +1) = 32.20 = 640.
c) 35.34 + 35.86 + 65.75 + 65.45 = 35.(34 + 86) + 65.(75 + 45)
= 120.35+120.65 -120.(35 + 65) = 12000.
d) 43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)
= 43.30 + 57.30 = 30. (43+57) = 3000.
e) 3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400.
f) 64.16 + 81.84+17.16 = 16.(64+17)+81.84 = 16.81+81.84
= 81.(16 + 84) = 8100
![](https://rs.olm.vn/images/avt/0.png?1311)
3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400
![](https://rs.olm.vn/images/avt/0.png?1311)
3*25*8+4*37*6+2*38*12=24*25+24*37+24*38=24*(25+37+38)=24*100=2400
3.25.8+4.6.37+2.38.12
<=> 24.25+24.37+24.38
<=> 24.(25+37+38)
<=> 24.100
<=> 2400
![](https://rs.olm.vn/images/avt/0.png?1311)
Biết làm câu b
=24.25+24.37+24.38
=24.(25+24+38)
=24.87
=2088
cau a là
29 + 135 + 234 + 865 + 766
=(135 + 865) + ( 234 + 766) + 29
= 1000 + 1000 + 29
= 2000 + 29
= 2029
câu b
3.25.8 + 4.37.6 + 2.38.12
= 3.8.25 + 4.6.37 + 2.12.38
=24.25 + 24.37 + 24.38
=24.(25+27+38)
=24.87
=2088
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.3.125.121.8\)
\(=375.121.8\)
\(=45375.8\)
\(=363000\)
\(b.37.64+37.36\)
\(=37.\left(64+36\right)\)
\(=37.100=3700\)
\(c.3.25.8+4.37.6+2.38.12\)
\(=600+888+912=2400\)
câu d là j e ghi rõ cho cj nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 35.34 + 35.86 + 65.75 + 65.75
= 35.(34 + 86) + 75.(65 + 65)
= 35.120 + 75.130
= 4200 + 9750
= 13950
b, 3.25.8 + 4.37.6 + 2.38.12
= 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38)
= 24. 100
= 2400
c,66.25 + 5.66 + 66.14 + 33.66
= 66 . (25 + 5 + 14 + 33)
= 66 .77
=5082
d, 48 .19 + 48.115 + 134.52
= 48 . (19 + 115) + 134.52
= 48 . 134 + 134.52
= 134 . (48 + 52)
= 134 . 100
= 13400
35.34+35.85+75+65.75
=13950
3.25.8+4.37.6=2.38.12
=2400
66.25+5.66+66.14+33.66
=5082
48.19=48.115+134.52
=13400
hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =274+184=458
b: =29+132+868+237+163
=1000+400+29
=1429
f: =A*135*137(1001-1001)=0
e: =24*25+24*37+24*38
=24*100=2400
c: =31(98+2)=31*100=3100
a, 23,56 + 56,77=80.3
b, 32,19 + 32 =64.2
c, 35,34 + 35,86 + 65,75 + 65,45=202.4
d, 43,17 + 29,57 + 13,43 + 57 =143.2
e, 3.25.8 + 4.37.6 + 2.38.12=2400
f, 64,16 + 81,84 + 17,16=163.2
Trả lời :
23,56 + 56,77
= 80,3
Hc tốt