一、解方程。
$32x - 120 = 520$
$x - \frac{2}{9} + \frac{1}{6} = \frac{1}{2}$
$3x + 5 × 7 = 40.4$
$6x - 0.4x = 11.2$
$4x ÷ 0.2 = 8$
$x - ( \frac{1}{3} + \frac{1}{4} ) = \frac{1}{12}$
$5x + 1.5 × 4 = 38.5$
$5x - 2x = 3.9$
$32x - 120 = 520$
$x - \frac{2}{9} + \frac{1}{6} = \frac{1}{2}$
$3x + 5 × 7 = 40.4$
$6x - 0.4x = 11.2$
$4x ÷ 0.2 = 8$
$x - ( \frac{1}{3} + \frac{1}{4} ) = \frac{1}{12}$
$5x + 1.5 × 4 = 38.5$
$5x - 2x = 3.9$
答案
$x=20$ $x=\frac{5}{9}$ $x=1.8$ $x=2$ $x=0.4$ $x=\frac{2}{3}$ $x=6.5$ $x=1.3$
二、看图列方程并求解。
1.
2.
3.
1.
2.
3.
答案
1.$5x=316$ $x=63.2$
2.$x+3x=640$ $x=160$
3.$2x+20=50×2$ $x=40$
2.$x+3x=640$ $x=160$
3.$2x+20=50×2$ $x=40$
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