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a ) 18 x 10 = 180
18 x 100 = 1800
18 x 1000 = 18000
82 x 100 = 8200
75 x 1000 = 75000
19 x 10 = 190
256 x 1000 = 256000
302 x 10 = 3020
400 x 100 = 40000
b ) 9000 : 10 = 900
9000 : 100 = 90
9000 : 1000 = 9
6800 : 100 = 68
420 : 10 = 42
2000 : 1000 = 2
20020 : 10 = 2002
200200 : 100 = 2002
2002000 : 1000 = 2002
a)18 x 10 = 180
18 x 100 = 1 800
18 x 1000 = 18 000
82 x 100 = 8 200
75 x 1000 = 75 000
19 x 10 = 190
256 x 1000 = 256 000
302 x 10 = 3 020
400 x 100 = 40 000
b)9000 : 10 = 900
9000 : 100 = 90
9000 : 1000 = 9
6800 : 100 = 68
420 : 10 = 42
2000 : 1000 = 2
20 020 : 10 = 2 002
200 200 : 100 = 2 002
2 002 000 : 1000 = 2 002
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\(\frac{x}{27}=\frac{12}{18}\)
Vì \(\frac{x}{27}=\frac{12}{18}\Rightarrow x\cdot18=27\cdot12\)
\(\Rightarrow x=\frac{27\cdot12}{18}=18\)
\(\frac{35}{49}=\frac{10}{x}\)
Vì \(\frac{35}{49}=\frac{10}{x}\Rightarrow35\cdot x=49\cdot10\)
\(\Rightarrow x=\frac{49\cdot10}{35}=14\)
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a, 35 - \(x\) < 35 - 5
35 - \(x\) < 30
\(x\) < 35 - 30
\(x\) < 5
\(x\) = 1; 2; 3; 4; 5
b, \(x\) - 10 < 35 - 10
\(x\) - 10 < 15
\(x\) < 15 + 10
\(x\) < 25
\(x\) = 0; 1; 2; 3; 4; 5; ....;24
c, \(x\) - 10 < 45
\(x\) < 45 + 10
\(x\) < 55
\(x\) = 0; 1; 2; 3; 4;...;54
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3 x 10 = 30
8 x 1000 = 8000
9000 x 100 =900000
80 x 100000=8000000
k nha
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ta có:x*18=12*27
x*18=324
x =324:18
x =18
vậy x =18
ta có:35*x=10*49
35*x=490
x=490:35
x=14
vậy x=14
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2/3 + 3/4=17/12
9/4 + 3/5=57/20
5/24 + 1/4=11/24
3/15 - 5/35=2/35 18/27 - 2/6=1/3 37/12 - 3=1/12
11/9 x 3/22=1/6 7/13 x 13/7=1 4 x6/7=24/7
2/5 : 3/10=4/3 3/8 : 9/4=1/6 8/21 : 4/7=2/3
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a, 18 x 5 x 11 = 9 x 2 x 5 x 11 =1
10 x 9 x22 5 x 2 x 9 x 11 x2 2
b, 40 x 6 x 35 = 5 x8 x 6 x 7 x 5 = 5
55 x 8 x 12 x7 11 x 5 x 8 x 6 x 2 x 7 22
35*10=350
18*10=180
9000:10=900
học tốt nhé
35x10=350
18x10=180
9000:10=900
Hok tốt!
@Kaito Kid