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1.8100
2. 34 x 18 + 18 x 66
= 18 x ( 34 + 66)
= 18 x 100 = 1800
3. X × ( 8 + 12) = 160 + 20 × 12
= X x 20 = 160 + 240
= X x 20 = 400
X = 400 : 20 = 20
4. X x 12 - X x 2 = 2020
(12 - 2) x X = 2020
10 x X = 2020
X = 2020 : 10 = 202
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Bài 1:
a: \(=\dfrac{21}{7}\cdot\dfrac{15}{45}\cdot\dfrac{9}{18}=3\cdot\dfrac{1}{3}\cdot\dfrac{1}{2}=\dfrac{1}{2}\)
b: \(=\dfrac{11}{33}\cdot\dfrac{24}{8\cdot12}\cdot\dfrac{27}{9}=\dfrac{24}{96}=\dfrac{1}{4}\)
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x - 36 : 18 = 12
x - 2 = 12
x = 12 + 2
x = 14
Vậy x cần tìm là 14
L I K E nha !!!
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x - 36 - 18 = 12
x - 36 = 12 + 18
x - 36 = 30
x = 30 + 36
x = 66
\(x-36-18=12\)
\(x\) \(=12+18+36\)
\(x\) \(=30+36\)
\(x\) \(=66\)
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18-(x:2+2) = 12
18 - x/2 - 2= 12
18 - 2 -x/2 = 12
16 - x/2 = 12
x/2 = 4
x = 8
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\(a)\frac{5}{12}+\frac{3}{14}+\frac{7}{12}=\left(\frac{5}{12}+\frac{7}{12}\right)+\frac{3}{4}=1+\frac{3}{4}=\frac{7}{4}\)
\(b)\frac{15}{14}\times\frac{17}{18}\times\frac{28}{15}=\frac{15\times17\times28}{14\times18\times15}=\frac{17}{9}\)
\(c)\frac{5}{8}\times\frac{5}{4}+\frac{5}{4}\times\frac{3}{8}=\frac{5}{4}\times\left(\frac{5}{8}+\frac{3}{8}\right)=\frac{5}{4}\times1=\frac{5}{8}\)
\(\frac{8}{x}+3=\frac{12}{18}\)
\(\frac{8}{x}=\frac{12}{18}-3\)
\(\frac{8}{x}=\frac{2}{3}-3\)
\(\frac{8}{x}=\frac{2}{3}-\frac{3}{1}\)
\(\frac{8}{x}=\frac{2}{3}-\frac{9}{3}\)
\(\frac{8}{x}=-\frac{7}{3}\)
\(\Rightarrow x=8\cdot3:\left(-7\right)\)
\(\Rightarrow x=24:\left(-7\right)\)
\(\Rightarrow x=-\frac{24}{7}\)
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Còn nếu đề là: \(\frac{8}{x+3}=\frac{12}{18}\) thì ta làm như sau:
Theo bài ra, ta có \(\frac{8}{x+3}=\frac{2}{3}\)
\(\Rightarrow x+3=8\cdot3:2\)
\(\Rightarrow x+3=24:2\)
\(\Rightarrow x+3=12\)
\(\Rightarrow x=12-3\)
\(\Rightarrow x=9\)
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