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![](https://rs.olm.vn/images/avt/0.png?1311)
a)48*(19+115)+134*52
48 *134 +134*52
134*(48+52)
134*100
13400
![](https://rs.olm.vn/images/avt/0.png?1311)
3,54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25
= 3,54 x ( 73 + 27 ) + 25 x ( 0,23 + 0,17 )
= 3,54 x 100 + 25 x 0,4
= 354 + 10
= 364
\(\text{3,54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25}\)
\(\text{= 3,54 x ( 73 + 27 ) + 25 x ( 0,23 + 0,17 )}\)
\(\text{= 3,54 x 100 + 25 x 0,4}\)
\(\text{= 354 + 10}\)
\(\text{= 364}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)12 x 18 + 14 x 3 - 255 : 17=25.58823529411765
b)68 + 42 x 5 - 625 : 25=5182
c) 13+ 21 x 5 - (198 : 11 - 8)=108
d) 1188 - 4 x (27 + 90 + 73 :10 )=
e) 5 + 8 + 11 + 14 +......+ 38 + 41=
f) 51 - 49 + 55 - 53 + 59 - 56 + 63 - 61 + 65=74
có mấy câu mình ko biết,xin lỗi bạn
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\(A=3+4+5+6+7+8+9+10+11\)
\(\Rightarrow A=\left(3+11\right)+\left(4+10\right)+\left(5+9\right)+\left(6+8\right)+7\)
\(\Rightarrow A=14+14+14+14+7\)
\(\Rightarrow A=14\times4+7\)
\(\Rightarrow A=56+7\)
\(\Rightarrow A=63\)
\(B=15.37.4+120.21+21.5.12\)
\(\Rightarrow B=60.37+60.2.21+21.60\)
\(\Rightarrow B=60.\left(37+2.21+21\right)\)
\(\Rightarrow B=60.100\)
\(\Rightarrow B=6000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài a,b tự làm:
c,99 x 2014-50 x 2014+2014
=(99-50+1) x 2014
=50 x 2014
=100700
d,(81 x 11):9
=891:9
=99
e,46 x 6+46 x 4
=46 x (4+6)
=46 x 10
=460
![](https://rs.olm.vn/images/avt/0.png?1311)
3,54 x 73 + 0,23 + 3,54 x 27 + 0,17 x 25 - 100 x 2,5
= ( 3,54 x 73 + 3,54 x 27 ) + ( 0,23 x 25 + 0,17 x 25 ) + 100 x 2.5
= 3,54 x (73 + 27) + 25 x ( 0,23 + 0,17 ) + 250
= 3,54 x 100 + 25 x 4 + 250
= 354 + 100 + 250
= 454 + 250
= 704
![](https://rs.olm.vn/images/avt/0.png?1311)
\(27+73-30:\left(25-10\right)\)=\(27+73-30:15\)=\(27+73-2\)=\(100-2=98\)
d). 27+73-30:(25-10)
=100-30:15
=100-2
=98
chúc bn học tốt