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a: \(24,8:0,5+24,8\cdot3+24,8:0,2\)
\(=24,8\cdot2+24,8\cdot3+24,8\cdot5\)
\(=24,8\left(2+3+5\right)\)
\(=24,8\cdot10=248\)
b: \(19,5+19,5\cdot3+19,5:0,5+19,5:0,25\)
\(=19,5+19,5\cdot3+19,5\cdot2+19,5\cdot4\)
\(=19,5\left(1+3+2+4\right)\)
\(=19,5\cdot10=195\)
c: \(121,07\cdot4+121,07:0,25+121,07:0,5\)
\(=121,07\cdot4+121,07\cdot4+121,07\cdot2\)
\(=121,07\left(4+4+2\right)\)
\(=121,07\cdot10=1210,7\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
X : 0,5 + X : 0,25 + X x 4 = 106,7
X x 2 + X x 4 + X x 4 = 106,7
X x (2 + 4 + 4) = 106,7
X x 10 = 106,7
X = 106,7 :10
X = 10,67
nhớ tick cho mik nha
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a, 2,5 x 16,27 x 4 + 7,3
\(=\left(2,5\times4\right)\times16,27+7,3\)
\(=10\times16,27+7,3\)
\(=162,7+7,3\)
\(=170\)
b, 0,25 x 1,25 x 8 x 4 x 0,5
\(=\left(0,25\times4\right)\times\left(1,25\times8\right)\times0,5\)
\(=1\times10\times0,5\)
\(=5\)
c, 500 x 3,26 x 0,02 : 0,5
\(=\left(500\times0,02\right)\times3,26\div0,5\)
\(=10\times3,26\times\frac{10}{5}\)
\(=3,26\times20\)
\(=65,2\)
d, 32,4 x 6,24 + 3,66 x 32,4 + 0,5
\(=32.4\times\left(3,66+6,24\right)+0,5\)
\(=32,4\times9,9+0,5\)
\(=320,76+0,5\)
\(=321,26\)
e, 17,2 x 9,55 + 9,45 x 17,2 + 17,2
![](https://rs.olm.vn/images/avt/0.png?1311)
cố gắng tìm nhân tử chung hay nhóm làm sao ra dcd số tròn chục hay trăm j đó là xong rồi
a) 2,5 x 16,27 x 4 + 7,3
= 2,5 x 4 x 16,27 + 7,3
= 10 x 16,27 + 7,3
= 162,7 + 7,3
= 170
b) 0,25 x 1,25 x 8 x 4 x 0,5
= (0,25 x 4) x (1,25 x 8) x 0,5
= 1 x 10 x 0,5
= 10 x 0,5
= 5
c) 500 x 3,26 x 0,02 : 0,5
= 500 x 3,26 x 0,02 x 2
= (500 x 2 x 0,02) x 3,26
= 20 x 3,26
= 2 x 3,26 x 10
= 6,52 x 10
= 65,2
d) 32,4 x 6,24 + 3,66 x 32,4 + 0,5
= 32,4 x (6,24 + 3,66) + 0,5
= 32,4 x 9,9 + 0,5
= 320,76 + 0,5
= 321,26
d) 17,2 x 9,55 + 9,45 x 17,2 + 17,2
= 17,2 x (9,55 + 9,45 + 1)
= 17,2 x 20
= 17,2 x 10 x 2
= 172 x 2
= 344
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1. \(x-8+32=68\)
\(x-8=68-32\)
\(x-8=36\)
\(x=36+8\)
\(x=44\)
_____
2. \(x+8+32=68\)
\(x+8=68-32\)
\(x+8=36\)
\(x=36-8\)
\(x=28\)
_____
3. \(98-x+34=43\)
\(98-x=43-34\)
\(98-x=9\)
\(x=98-9\)
\(x=89\)
_____
4. \(98+x-34=43\)
\(98+x=43+34\)
\(98+x=77\)
\(x=77-98\)
\(x=-21\)
_____
5. \(x:5:4=800\)
\(x:5=800.4\)
\(x:5=3200\)
\(x=3200.5\)
\(x=16000\)
_____
6. \(18+x=384:8\)
\(18+x=48\)
\(x=48-18\)
\(x=30\)
_____
7. \(\left(84,6-2\times x\right):3,02=5,1\)
\(84,6-2.x=5,1.3,02\)
\(84,6-2.x=15,402\)
\(2.x=84,6-15,402\)
\(2.x=69,198\)
\(x=69,198:2\)
\(x=34,599\)
_____
8. \(x\times5=120:6\)
\(x.5=20\)
\(x=20:5\)
\(x=4\)
_____
9. \(\left(15\times24-x\right):0,25=100:0,25\)
\(\left(15.24-x\right):0,25=400\)
\(15.24-x=400.0,25\)
\(15.24-x=100\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
1,x-8+32=68
=>x-8=68-32=36
=>x=36+8=42
2,x+8+32=68
=>x+8=68-32=36
=>x=36-8=28
3,98-x+34=43
=>98-x=43-34=9
=>x=98-9=89
4,98+x-34=43
=>98+x=43+34=77
=>x=77-98=-21
5,x:5:4=800
=>x:20=800
=>x=800x20=16000
6,18+x=384:8=48
=>x=48-18=30
7,(84,6-2x):3,02=5,1
=>84,6-2x=5,1x3,02=15,402
=>2x=84,6-15,402=69,198
=>x=69,198:2=34,599
8,5x=120:6=20
=>x=20:5=4
9,(15x24-x):0,25=100:0,25=400
=>360-x=400x0,25=100
=>x=360-100=260.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(60+x-34=43\Rightarrow x=43+34-60=17\)
\(23x-6.23+69x=230\)
\(\Rightarrow23x+69x=230+6.23\)
\(\Rightarrow92x=368\Rightarrow x=368:92\Rightarrow x=4\)
\(\left(15.24-x\right):0,25=100:0,25\)
\(\Rightarrow\left(360-x\right)=100:0,25.0,25\)
\(\Rightarrow360-x=100\Rightarrow x=360-100=260\)
\(\left(7x+8\right):5=10\Rightarrow\left(7x+8\right)=10.5\)
\(\Rightarrow7x+8=50\Rightarrow7x=50-8\Rightarrow7x=42\Rightarrow x=42:7=6\)
\(280:\left(7+3x\right)=4\Rightarrow\left(7+3x\right)=280:4\)
\(\Rightarrow7+3x=70\Rightarrow3x=70-7\Rightarrow3x=63\Rightarrow x=63:3=21\)
\(\left(x+5\right)x19:13=57\)
\(\Rightarrow\left(x+5\right)x19=57.13\)
\(\Rightarrow\left(x+5\right)=741:19\Rightarrow x+5=39\Rightarrow x=39-5=34\)
\(4\left(36-4x\right)=64\)
\(\Rightarrow\left(36-4x\right)=64:4\)
\(\Rightarrow36-4x=16\)
\(\Rightarrow4x=36-16\Rightarrow4x=20\Rightarrow x=20:4=5\)
\(\left(7,6:1,9\right)x=3,2\)
\(\Rightarrow4x=3,2\Rightarrow x=3,2:4=0,8\)
\(\left(x:2+50\right):5=12\)
\(\Rightarrow x:2+50=12.5\)
\(\Rightarrow x:2=60-50\Rightarrow x:2=10\Rightarrow x=10.2=20\)
57 + X x 4 = 68,4
X x 4 = 68,4 - 57
X x 4 = 11,4
X = 11,4 : 4
X = 2,85
4 x X + X : 0,25 + X : 0,5 = 120
X x 4 + X x 4 + X x 2 = 120
X x (4 + 4 + 2) = 120
X x 10 = 120
X = 120 : 10
X = 12
a)57 + x* 4 = 68,4
=>x*4=11,4
=>x=2,85
b)4 *x + x : 0,25 + x : 0,5 = 120
=>4*x+x*4+x*2=120
=>x*(4+4+2)=120
=>x*10=120
=>x=12