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\(x\cdot\dfrac{3}{7}-x\cdot\dfrac{1}{2}=\dfrac{3}{5}\)
\(x\left(\dfrac{3}{7}-\dfrac{1}{2}\right)=\dfrac{3}{5}\)
\(x\cdot\dfrac{-1}{14}=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}:\dfrac{-1}{14}\)
\(x=\dfrac{-42}{5}\)
a ) \(\frac{3}{8}+\left(x-\frac{5}{24}\right):\frac{2}{3}=1\) | \(\left(x-\frac{5}{24}\right):\frac{2}{3}=1-\frac{3}{8}=\frac{5}{8}\)
\(x-\frac{5}{24}=\frac{5}{8}\times\frac{2}{3}=\frac{10}{24}=\frac{5}{12}\) | \(x=\frac{5}{12}+\frac{5}{24}=\frac{15}{24}=\frac{5}{8}\)
b ) \(125\div x+375\div x-200\div x=12\)
\(\frac{125}{x}+\frac{375}{x}-\frac{200}{x}=12=\frac{300}{x}\)
\(x=300\div12=25\)
\(\frac{\left(2002+1\right)\times1986+2002\times17+2020}{2003\times\left(2003+1\right)-2003\times2003}\times X=4008\)
\(\frac{2002\times1986+2002\times17+1986+2020}{2003}\times X=4008\)
\(\frac{2002\times\left(1986+17\right)+4006}{2003}\times X=4008\)
\(\frac{2002\times2003+4006}{2003}\times X=4008\)
\(\left(2002+2\right)\times X=4008\)
\(2004\times X=4008\)
\(X=2\)
Vậy X = 2.
a, 2x3x4x8x25x125= (2x3)x(4x25)x(8x125)= 6x100x1000=600000
b,42/5 +56/9+23/4+3/5+1/3+1/4= (42/5+3/5)+(23/4+1/4)+(56/9+1/3)=9+6+59/9=
128 x X - 12 x X - 16 x X = 5 208 000
X x ( 128 - 12 - 16 ) = 5 208 000
X x 100 = 5 208 000
X = 5 208 000 : 100 = 52 080
Câu còn lại tự làm nhé !
dạ em cảm ơn