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\(x:100+x:10=0,66\)
\(x\times\frac{1}{100}+x\times\frac{1}{10}=0,66\)
\(x\times\left(\frac{1}{100}+\frac{1}{10}\right)=0,66\)
\(x\times\left(0,01+0,1\right)=0,66\)
\(x\times0,11=0,66\)
\(x=\frac{0,66}{0,11}=6\)
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a) 17,34 x 99 + 18 - 0,66
= 17,34 x 99 + 17,34 x 1
= 17,34 x (99 + 1)
= 17,34 x 100
= 1734
b) 7,63 x 12,47 + 12,47 x 2,37
= 12,47 x (7,63 + 2,37)
= 12,47 x 10
= 124,7
c) 112,37 x 4,29 - 4,29 x 12,37
= 4,29 x (112,37 - 12,37)
= 4,29 x 100
= 429
d) 17,4 x 52 + 57 x 17,4 - 17,4 x 9
= 17,4 x (52 + 57 - 9)
= 17,4 x 100
= 1740
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a: =20,23(15,75+85,25-1)
=20,23*100
=2023
b: =4+4=8
c: =6,48(111-1-10)=648
d: =1,25*8*0,25*4
=10
a. 20,23 x 15,75 + 20,23 x 85,25 - 20,23
= 20,23 . (15,75 + 85,25 - 1)
= 20,23 . 100
= 2023
b.0,66 + 1,2+ 3,34+2,8
= 4+4
= 8
c.111 x 6,48 -6,48 - 6,48 x 10
= 6,48 . (111 - 1 -10)
= 648
d.1,25 x 0,25 x 8 x 4
= 1,25 . 8 . 0,25 . 4
= 10
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A = 35 , 7 x 99 + 35 + 0 , 7
A = 35 ,7 x 99 + 35 , 7
A = 35 , 7 x ( 99 + 1 )
A = 35 , 7 x 100
A = 3570
B = 17 , 34 x 99 + 18 - 0 , 66
B = 17 , 34 x 99 + 17 , 34
B = 17 , 34 x ( 99 + 1 )
B = 17 , 34 x 100
B = 1734
![](https://rs.olm.vn/images/avt/0.png?1311)
- 1,8+0,66+1,2+0,34
=(1,8+1,2)+(0,66+0,34)=3+1=4
- 6,48 x 1125 - 6,48 x 112 - 6,48 x 13
=6,48 x (1125-112 -13)=6,48 x 1000= 6480
- 24,5 x 4,8 + 15,6 x 4,8
=4,8 x ( 24,5 +15,6)=4,8 x 40,1 =192,48
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a. ( 6,28 + 3,72) x 18,24
= 10 x 18,24 = 182,4
b. 35,7 x 99 + ( 35 + 0,7 )
= 35,7 x 99 + 35,7
= 35,7 x ( 99 +1 )
= 35,7 x 100
= 357
c. 17,34 x 99 + ( 18 - 0,66)
= 17,34 x 99 + 17,34
= 17,34 x ( 99 + 1)
= 17,34 x 100
= 1734
d. 0,9 x 95 + 0,9 x 2 x 2 + 0,9
= 0,9 x ( 95 + 2 x 2 + 1)
= 0,9 x 100
= 90
e. (0,25 x 40) x 611,7
= 10 x 611,7
= 6117
g. 37,2 x 101 - 37 - 0,2
= 37,2 x 101 - (37 + 0,2)
= 37,2 x 101 - 37,2
= 37,2 x ( 101 - 1)
= 372
a) \(6,28\cdot18,24+18,24\cdot3,72\)
\(=18,24\left(6,28+3,72\right)\)
\(=18,24\cdot10\)
\(=182,4\)
b) \(35,7\cdot99+35+0,7\)
\(=35,7\cdot99+35,7\)
\(=35,7\left(99+1\right)\)
\(=35,7\cdot100\)
\(=3570\)
c) \(17,34\cdot99+18-0,66\)
\(=17,34\cdot99+17,34\)
\(=17,34\left(99+1\right)\)
\(=17,34\cdot100\)
\(=1734\)
d) \(0,9\cdot95+1,8\cdot2+0,9\)
\(=0,9\cdot95+0,9\cdot2\cdot2+0,9\)
\(=0,9\left(95+4+1\right)\)
\(=0,9\cdot100\)
\(=90\)
e) \(0,25\cdot611,7\cdot40\)
\(=\left(40\cdot0,25\right)\cdot611,7\)
\(=10\cdot611,7\)
\(=6117\)
g) \(37,2\cdot101-37-0,2\)
\(=37,2\cdot101-37,2\)
\(=37,2\left(101-1\right)\)
\(=37,2\cdot100\)
\(=3720\)
= 0,66 x ( 4,93 - 0,93 )
= 0,66 x 4
= 2,64
TL:
0,66 x 4,93 - 0,66 x 0,93
= 0,66 x (4,93 - 0,93)
= 0,06 x 4
= 2,64
HT