求解表达式:$\frac{x-7}{3} = \frac{x-1}{5}$
已知:$\frac{x-7}{3} = \frac{x-1}{5}$
求解:求 $x$
解
$\frac{x-7}{3} = \frac{x-1}{5}$
交叉相乘
$5(x-7) = 3(x-1)$
$5x -35 = 3x - 3$
$5x - 3x = -3 + 35$
$2x = 32$
$x = 16$
因此,$x$ 的值为广告
已知:$\frac{x-7}{3} = \frac{x-1}{5}$
求解:求 $x$
解
$\frac{x-7}{3} = \frac{x-1}{5}$
交叉相乘
$5(x-7) = 3(x-1)$
$5x -35 = 3x - 3$
$5x - 3x = -3 + 35$
$2x = 32$
$x = 16$
因此,$x$ 的值为