\(\frac{\left(3x+4\right)}{5}=8\Leftrightarrow3x+4=40\Leftrightarrow x=12\)
\(\frac{17\left(x-12\right)}{11}=51\Leftrightarrow17x-204=561\Leftrightarrow x=45\)
\(4,8x+5,2x=160\Leftrightarrow x\left(4,8+5,2\right)=160\Leftrightarrow10x=160\Leftrightarrow x=16\)
(3* x + 4 ) : 5 = 8 ( x - 12 ) * 17 : 11 = 51 4.8 * x + 5.2 * x = 160
(3* x +4 ) = 8 x5 ( x - 12 ) * 17 = 51 x 11 x * ( 4.8 + 5.2 ) = 160
( 3 * x + 4) = 40 ( x - 12 ) * 17 = 561 x * 10 = 160
3 * x = 40 - 4 x - 12 = 561 : 17 x = 160 : 10
3 * x = 36 x - 12 = 33 x = 16
x = 36 : 3 x = 33 + 12
x = 12 x = 45
( 3 * x + 4 ) : 5 = 8 ( x - 12 ) * 17 : 11 = 51 4,8 * x + 5,2 * x = 160
( 3 * x + 4 ) = 8 * 5 ( x - 12 ) * 17 = 51 * 11 x * ( 4,8 + 5,2 ) = 160
( 3 * x + 4 ) = 40 ( x - 12 ) * 17 = 561 x * 10 = 160
3 * x = 40 - 4 x * 12 = 561 : 17 x = 160 : 10
3 * x = 36 x * 12 = 33 x = 16
x = 36 : 3 = 12 x = 33 : 12 = 2,75
câu 2 mk làm sai, mk làm lại nha:
( x - 12 ) * 17 : 11 = 51
( x - 12 ) * 17 = 51 * 11
( x - 12 ) * 17 = 561
( x - 12 ) = 561 : 17
( x - 12 ) = 33
x = 33 + 12 = 45
