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a)3x(x+726)=2745.
= x+726 =2745:3.
= x+726 =915.
= x =915-726
= x =189.
b)(x+426):3=2625.
= x+426 =2625x3
= x+426 =7875
= x =7875-426
= x =7449.
c)(9458-x)x5=41195.
= 9458-x =41195:5
= 9458-x =8239.
= x =9458-8239.
= x =1219.
d)Sai đề rồi bạn nhé.
![](https://rs.olm.vn/images/avt/0.png?1311)
5625 - 5000 : (726 : 6 - 113)
= 5000 - 5000 : (121 - 21)
= 5000 - 5000 : 100 = 5000 - 50 = 4950
![](https://rs.olm.vn/images/avt/0.png?1311)
\(345km^2-45m^2\times4\)
\(=345000000m^2-45m^2\times4\)
\(=345000000m^2-180m^2\)
\(=344999820m^2\)
\(3km^26m^2+726589m^2\)
\(=3000006m^2+726589m^2\)
\(=3726595m^2\)
345km2−45m2×4345km2−45m2×4
=345000000m2−45m2×4=345000000m2−45m2×4
=345000000m2−180m2=345000000m2−180m2
=344999820m2=344999820m2
3km26m2+726589m23km26m2+726589m2
=3000006m2+726589m2=3000006m2+726589m2
=3726595m2
![](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)
468:6+61x2
=78+122
=200
5625-5000:(726:6-113)
=5625-5000:8
=5625-625
=5000
![](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
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đáp án a
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