A=3+9+15+....+213+219
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left[\left(10-2.30.5\right)+2.6\right]:2+\left(4.5\right)^2\)
\(=\left[\left(10-300\right)+2.6\right]:2+20^2\)
\(=\left(-290+2.6\right):2+400\)
\(=\left(-290+12\right):2+400\)
\(=-278:2+400\)
\(=-139+400\)
\(=-\left(139-400\right)\)
\(=-\left(-261\right)\)
\(=261\)
b) \(536.27-9\left(825+219\right):18+15^3:15^2.4^2.3\)
\(=536.27-9.1044:18+15^3:15^2.4^2.3\)
\(=14472-9396:18+15^3:15^2.4^2.3\)
\(=14472-522+15^3:15^2.4^2.3\)
\(=13920+15^{3-2}.4^2.3\)
\(=13920+15.4^2.3\)
\(=13920+15.16.3\)
\(=13920+240.3\)
\(=13920+720\)
\(=14640\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-52+1)-9.3
=26-27
=-1
b)80-(4.52-3.23)
=80-(100-24)
=80-76
=4
c) [(-18)+(-7)]-15
=-25-15
=-40
d) (-219)-(-229)+12.5
=10+60
=70
![](https://rs.olm.vn/images/avt/0.png?1311)
tính bằng cách thuận tiên nhất :
`a,213 + 367 - 267 - 33`
`=213 + (367 - 267)-33`
`=213 + 100 -33`
`= 313-33`
`=280`
`b,15 - 14 + 13 - 12 + 11 - 10 + 9 - 8`
`=(15-14)+(13-12)+(11-10)+(9-8)`
`= 1 + 1 + 1 +1`
`= 2+2`
`=4`
a, 213 + 367 - 267 - 33
= (213 - 33) + (367 - 267)
= 180 + 100
= 280
b, 15 - 14 + 13 - 12 + 11 - 10 + 9 - 8
= (15 - 14) (9 - 8)
= 1 + 1 + 1 + 1
= 4
![](https://rs.olm.vn/images/avt/0.png?1311)
easy
a) {6000 :[219-(25-6)]}: 15 -2
{6000 : [ 219- 19]} : 15 -2
{6000 :200 } : 15 -2
30 : 15 -2
2-2=0
b) 407-{[(180-160):4+9]:2}
407-{[20:4+9]:2}
407-{14:2}
407-7=400
c)4.15.17+5.12.27+6.10.56
1020+1620+3360
=6000
nhớ k mình nha
a.(6000:200):15-2
30-15-2=0
b.407-[(5+9):2]
407-7
400
c.60*17+60*27+60*56
60*(17+27+56)
6000
![](https://rs.olm.vn/images/avt/0.png?1311)
a, -(x+84) + 213=-16
-(x+84)+231=-16
-(x+84)=-16-231
-(x-84)=-247
=>x+84=247
x=247-84
x=163
b, -12 (x-15)+ 7(3-x) = 15
-12x+180+21-7x=15
(-12x-7x)+(180+21)=15
-19x+201=15
-19x=15-201
-19x=-186
x=-186:-19
x=186/19
![](https://rs.olm.vn/images/avt/0.png?1311)
A = ( 219+3 ) * [( 219-3 ):6 ] : 2 = 3996