[( 8x - 12 ) : 4 ] . 33 = 36
[ ( 8x - 12 ) : 4 ] = 12/11
( 8x - 12 ) = 12/11 . 4
( 8x - 12 ) = 48/11
8x = 48/11 + 12
8x = 180/11
x = 45/22
\(\left[\left(8x-12\right):4\right].33=36\)
\(\left(8x-12\right):4=\frac{12}{11}\)
\(8x-12=\frac{48}{11}\)
\(8x=\frac{180}{11}\)
\(x=\frac{45}{22}\approx2,045\)
\(30-\left[4.\left(x-2\right)+15\right]=3\)
\(4.\left(x-2\right)+15=27\)
\(4.\left(x-2\right)=12\)
\(x-2=3\)
\(x=5\)
\(a,\left[\left(8x-12\right)\div4\right].33=36\)
\(\Leftrightarrow\left(8x-12\right)\div4=36\div33\)
\(\Leftrightarrow\left(8x-12\right)\div4=\frac{12}{11}\)
\(\Leftrightarrow8x-12=\frac{12}{11}\times4\)
\(\Leftrightarrow8x-12=\frac{48}{11}\)
\(\Leftrightarrow8x=\frac{48}{11}+12\)
\(\Leftrightarrow8x=\frac{180}{11}\)
\(\Leftrightarrow x=\frac{180}{11}\div8\)
\(\Leftrightarrow x=\frac{45}{22}\)
\(b,30-\left[4.\left(x-2\right)+15\right]=3\)
\(\Leftrightarrow4.\left(x-2\right)+15=30-3\)
\(\Leftrightarrow4x-8+15=27\)
\(\Leftrightarrow4x-8=27-15\)
\(\Leftrightarrow4x-8=12\)
\(\Leftrightarrow4x=12+8\)
\(\Leftrightarrow4x=20\)
\(\Leftrightarrow x=20\div4\)
\(\Leftrightarrow x=5\)
[(8x - 12) : 4] . 33 = 36
(8x - 12) : 4 =36 : 33
(8x - 12) : 4 = 12/11
8x - 12 = 12/11 .4
8x - 12 = 48/11
8x = 48/11 +12
8x = 180/11
x = 180/11 : 8
x = 45/22
30 - [ 4. ( x - 2 ) + 15 ] = 3
4. ( x -2) + 15 = 30 - 3
4. ( x -2) + 15 = 27
4. ( x -2) = 27 - 15
4. ( x -2) = 12
x -2 = 12 : 4
x -2 = 3
x = 3 + 2
x = 5
