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a: \(17,5\cdot4\cdot3\cdot25\)
\(=17,5\cdot3\cdot\left(4\cdot25\right)\)
\(=52,5\cdot100=5250\)
b: \(25,6\cdot7,5+25,6\cdot2,5\)
\(=25,6\left(7,5+2,5\right)\)
\(=25,6\cdot10=256\)
c: \(4,52\cdot12,5-2,5\cdot4,25\)
\(=2,5\left(4,52\cdot5-4,25\right)\)
\(=2,5\cdot18,35=45,875\)
d: \(7,7\cdot9+7,7\)
\(=7,7\left(9+1\right)\)
\(=7,7\cdot10=77\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=25,6.23,6+49,5.2.25,6+25,6\)
\(=25,6.23,6+99.25,6+25,6\)
\(=25,6\left(23,6+99+1\right)\)
\(=25,6.123,6=3164,16\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(25,6\times92+25,6:0,5+25,6:0,2+25,6\)
\(=25,6\times92+25,6\times2+25,6\times5+25,6\times1\)
\(=25,6\times\left(92+2+5+1\right)\)
\(=25,6\times10\)
\(=256\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25,6 + 27,5 x 2,6 = 25,6 + 71,5 = 97,1
b) (25,6 + 27,5) x 2,6 = 53,1 x 2,6 = 138,06
![](https://rs.olm.vn/images/avt/0.png?1311)
25,6 x 23,6 + 49,5 x 51,2 + 25,6
= 25,6 x 23,6 + 49,5 x 2 x 25,6 + 25,6
= 25,6 x ( 23,6 + 49,5 x 2 + 1)
= 25,6 x 123,6
= 3 164, 16
![](https://rs.olm.vn/images/avt/0.png?1311)
a, x+25,6:3,2=10,5
x+8=10,5
x=10,5-8
x=2,5
b, 3,14:x+6,86:x=4
(3,14+6,86):x=4
10:x=4
x=10:4
x=2,5
a) x+ 8=10,5 suy ra x=10,5-8=-2,5
b) suy ra (3,14+6,86):x=4
suy ra 10:x=4
suy ra x=10:4=5/2
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 13,5 = (25,6 + 3,14) x 3
x + 13,5 = 86,22
x = 86,22 - 13,5
x = 72,72
x + 13,5 = 28,74 nhân 3
x + 13,5 =86,22
x =86,22 - 13,5
x = 72,72
ok nha
25,6 x37,2 -25,6 x 3+ 64,48 x25,6 +25,6
=25,6x(37,2-3+64,48+1)
=25,6x99,68
=2551,808
26,3 :4 + 75,7 : 4 -2 :2
=(26,3+75,7):4-2:2
=102:4-2:2
=25,5-1
=24,5