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x + 30% x = - 1,3
x ( 100% + 30% ) = - 1,3
x . 130% = - 1,3
x = - 1,3 : 130%
x = - 1,69
a) 187 - {[497 - ( 8 x X + 11) : X] : 3 - 78} = 150
=> {[497 - ( 8 x X + 11) : X] : 3 - 78} = 187 - 150
=> {[497 - (8 x X + 11) : X] : 3 - 78} = 37
=> [497 - (8 x X +11): X ] : 3 - 78 = 37
=> [497 - (8 x X + 11) : X] : 3 = 115
=> 497 - ( 8 x X + 11) : X = 345
=> (8 x X + 11) : X = 497 - 345 = 152
=> 8X + 11 = 152X
=> 152X - 8X = 11
=> 144X = 11
=> X = 11/144
b) 19,96 + 4,19 - 24,15 : \(\left(x:\frac{1}{4}-\frac{1}{4}\right)=23,15\)
=> 19,96 + 4,19 - 24,15 : \(\left(x\cdot4-\frac{1}{4}\right)=23,15\)
=> 24,15 - 24,15 : \(\left(x\cdot4-\frac{1}{4}\right)\)= 23,15
=> 24,15 : \(\left(x\cdot4-\frac{1}{4}\right)\)= 1
=> \(x\cdot4-\frac{1}{4}=24,15\)
=> \(x\cdot4=24,15+\frac{1}{4}=24,4\)
=> x = 24,4 : 4 = 6,1
Còn câu c tương tự
a) \(\left(0,75-40\%x\right).\frac{3}{4}-\frac{1}{4}=-2\frac{1}{3}\)
\(\Rightarrow\left(\frac{3}{4}-\frac{2}{5}x\right).\frac{3}{4}-\frac{1}{4}=-\frac{7}{6}\)
\(\Rightarrow\left(\frac{3}{4}-\frac{2}{5}x\right).\frac{3}{4}=-\frac{7}{3}+\frac{1}{4}\)
\(\Rightarrow\left(\frac{3}{4}-\frac{2}{5}x\right).\frac{3}{4}=-\frac{28}{12}+\frac{3}{12}=\frac{25}{12}\)
\(\Rightarrow\frac{3}{4}-\frac{2}{5}x=\frac{25}{12}:\frac{3}{4}=\frac{25}{12}.\frac{4}{3}=\frac{25}{9}\)
\(\Rightarrow\frac{2}{5}x=\frac{3}{4}-\frac{25}{9}=\frac{27}{36}-\frac{100}{36}=-\frac{73}{36}\)
\(\Rightarrow x=-\frac{73}{36}:\frac{2}{5}=-\frac{73}{36}.\frac{5}{2}=-\frac{365}{72}\)
Ta có:
a) \(\Leftrightarrow3\left(x+2\right)=-4\left(x-5\right)\)
\(\Leftrightarrow3x+6=-4x+20\)
\(\Leftrightarrow7x=14\Leftrightarrow x=2\)
a, => x( 40% - 1 ) = 3,6
x( 0,4 - 1 ) = 3,6
-0,6x = -3,6
x = -3,6 : (-0,6)
x = 6
a = 6 ban nha