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X \(⋮\)12 = B(12)
B(12) = { 12 ; 24 ; 36 ; 48 ; 60 ; ... }
12 \(\le\)X\(\le\)50 => X = { 12 ; 24 ; 36 ; 48 }
Hok tốt
\(15.\left(x+2\right)-12.\left(x-5\right)+21x=210\)
\(15x+30-12x+60+21x=210\)
\(24x+90=210\)
\(24x=120\)
\(x=5\)
\(\frac{-7}{12}:\frac{13}{6}+\frac{-7}{12}:\frac{13}{7}.\frac{2.|-8|}{3}\)
\(=\frac{-7}{12}.\frac{6}{13}+\frac{-7}{12}.\frac{7}{13}.\frac{2.8}{3}\)
\(=\frac{-7}{12}.\left(\frac{6}{13}+\frac{7}{13}.\frac{2.8}{3}\right)\)
\(=\frac{-7}{12}.\frac{10}{3}\)
\(=\frac{-35}{18}\)
\(\frac{-7}{12}:\frac{13}{6}+\frac{-7}{12}:\frac{13}{7}\times\frac{2\times\left|-8\right|}{3}\)
\(=\frac{-7}{12}\times\frac{6}{13}+\frac{-7}{12}\times\frac{7}{13}\times\frac{2\times8}{3}\)
\(=\frac{-7}{12}\times\left(\frac{6}{13}+\frac{7}{13}+\frac{2\times8}{3}\right)\)
\(=\frac{-7}{12}\times\frac{10}{3}\)
\(=\frac{-35}{18}\)
Rất vui khi giúp đc bạn.<3. Nếu có sai sót mong bạn bỏ qua
\(x⋮12;25;30\Rightarrow x\in BC\left(12;25;30\right)\)
\(12=2^2.3;25=5^2;30=2.3.5\)
\(BCNN\left(12;25;30\right)=2^2.3.5^2=300\)
\(BC\left(12;25;30\right)=B\left(300\right)\)
\(B\left(300\right)=\left\{0;300;600;....\right\}\)
\(0\le x\le500\Rightarrow x=300\)
\(\left(3x-2^4\right).7^3=2.7^4\)
\(\left(3x-16\right)=2.7\)
\(3x-16=14\)
\(3x=30\)
\(x=10\)
\(\left|x-5\right|=16+2.\left(-3\right)\)
\(\left|x-5\right|=10\)
\(\Leftrightarrow x-5=10\Rightarrow x=15\)
\(\Leftrightarrow x-5=-10\Rightarrow x=-5\)
\(\frac{3}{5}.\frac{8}{27}.\frac{5}{3}=1.\frac{8}{27}.1=\frac{8}{27}\)
\(\frac{7}{19}.\frac{1}{3}+\frac{7}{19}.\frac{2}{3}=\frac{7}{19}.\left(\frac{1}{3}+\frac{2}{3}\right)=\frac{7}{19}.1=\frac{7}{19}\)
\(\frac{12}{5}.4-4.\frac{7}{5}=4\left(\frac{12}{5}-\frac{7}{5}\right)=4.1=4\)
\(\frac{3}{5}x\frac{8}{27}x\frac{5}{3}\)
\(=\frac{3}{5}x\frac{5}{3}x\frac{8}{27}\)
\(=1x\frac{8}{27}\)
\(=\frac{8}{27}\)
\(\frac{7}{19}x\frac{1}{3}+\frac{7}{19}x\frac{2}{3}\)
\(=\frac{7}{19}x\left(\frac{1}{3}+\frac{2}{3}\right)\)
\(=\frac{7}{19}x1=\frac{7}{19}\)
\(\frac{12}{5}x4-4x\frac{7}{5}\)
\(=4x\left(\frac{12}{5}-\frac{7}{5}\right)\)
\(=4x1=4\)
Đúng luôn nên các bn nhớ k mk nhé
a) \(\dfrac{2}{3}.x-\dfrac{1}{2}.x=\dfrac{5}{12}\)
=> \(\left(\dfrac{2}{3}-\dfrac{1}{2}\right).x=\dfrac{5}{12}\)
=> \(\left(\dfrac{4}{6}-\dfrac{3}{6}\right).x=\dfrac{5}{12}\)
=> \(\dfrac{1}{6}\) . x = \(\dfrac{5}{12}\)
=> \(x=\dfrac{5}{12}:\dfrac{1}{6}\)
=> x =\(\dfrac{5}{12}.\dfrac{6}{1}\)
=> x = \(\dfrac{5}{2}\)
Vậy x = \(\dfrac{5}{2}\)
\(5\frac{4}{7}:x=13\)
\(\frac{2}{3}\times x-0,5\times x=\frac{5}{12}\)
\(y-85\%\times y=1\frac{1}{5}\)
\(5\frac{4}{7}:x=13\)
=> \(x=\frac{39}{7}:13\)
=> \(x=\frac{3}{7}\)
\(\frac{2}{3}x-0,5x=\frac{5}{12}\)
\(\Leftrightarrow x\left(\frac{2}{3}-0,5\right)=\frac{5}{12}\)
\(\Leftrightarrow x\left(\frac{4}{6}-\frac{3}{6}\right)=\frac{5}{12}\)
\(\Leftrightarrow\frac{1}{6}x=\frac{5}{12}\)
\(\Leftrightarrow x=\frac{5}{12}\div\frac{1}{6}\)
\(\Leftrightarrow x=\frac{5}{2}\)
\(12\cdot12\cdot12\cdot12\cdot12=12^5=248832\)
248832