a) 168 x 2 : 6 x 4 b) 570 - 225 x 2
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) 570 - 225 - 167 + 67
= 345 - 167 + 67 = 178 + 67 = 245
168 x 2 : 6 x 4 = 336 : 6 x 4 = 56 x 4 = 224
b) 468 : 6 + 61 x 2 = 78 + 122 = 200
5625 - 5000 : (726 : 6 - 113)
= 5000 - 5000 : (121 - 21)
= 5000 - 5000 : 100 = 5000 - 50 = 4950
![](https://rs.olm.vn/images/avt/0.png?1311)
570-225-167+67=345-167+67
=178+67=245
168x2:6x4=336:6x4=56x4=224
b)468:6+61x2=78+61x2=78+122=200
5625-5000:(726:6-113)=5625-5000:8=5625-625=5000
tick cho minh nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 570 - 225 - 167 + 67
= 345 - 167 + 67
= 178 + 67
= 245
168 x 2 : 6 x 4
= 336 : 6 x 4
= 56 x 4
= 224
b) 468 : 6 + 61 x 2
= 78 + 122
= 200
5625 - 5000 : (726 : 6 - 113)
=5625-5000:(121-113)
=5625-5000:8
=5625-625
=5000
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
3:
a: 3^x*3=243
=>3^x=81
=>x=4
b; 2^x*16^2=1024
=>2^x=4
=>x=2
c: 64*4^x=16^8
=>4^x=4^16/4^3=4^13
=>x=13
d: 2^x=16
=>2^x=2^4
=>x=4
![](https://rs.olm.vn/images/avt/0.png?1311)
b/ x + (x + 1) + (x + 2) + .... + (x + 30) = 1240
x + (x + x + ....+ x) + (1 + 2 + ... + 30) = 1240
x + 30x + 465 = 1240
31x = 1240 - 465
31x = 775
=> x = 775 : 31 = 25
c/ Sửa đề (x + 4) + (x + 6) + (x + 8) + .... + (x + 26) = 210
(x + x + x + .... + x) + (4 + 6 + 8 + .... + 26) = 210
12x + 180 = 210
12x = 210 - 180 = 30
=> x = 30 : 12 = 2,5
![](https://rs.olm.vn/images/avt/0.png?1311)
1 000 000 x 2 x 4 x 8 x 16 x 32 x 64 x 128 x 256 x 512 x 1024 x 2048 x 4096 x 8192=10000000248163264
a) 168 x 2 : 6 x 4 = 224 b) 570 - 225 x 2 = 120
168 *2: 6 *4 = 224 570- 225 *2 =120