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一、解方程或比例。
$x + 25\%x = 40$ $40×5 + 5.5x = 640$ $2.7:x = 5:1.25$
$8x + 2.4 = 3.6$ $\frac{3}{8}x÷12 = 50\%$ $x:42 = \frac{3}{7}:10$
$40x + 5×1.2 = 25$ $\frac{1.2}{75} = \frac{0.4}{x}$ $8x - 0.36×2 = 0.08$
$8x÷\frac{1}{2} = \frac{3}{5}$ $75\%x - \frac{1}{4}x = 9$ $\frac{5}{9} + \frac{1}{4}x = \frac{2}{3}$
$4:x = \frac{2}{3}:6$ $6 = (10 + x):2$ $(4.5 + x):8 = \frac{3}{2}$
$x + 25\%x = 40$ $40×5 + 5.5x = 640$ $2.7:x = 5:1.25$
$8x + 2.4 = 3.6$ $\frac{3}{8}x÷12 = 50\%$ $x:42 = \frac{3}{7}:10$
$40x + 5×1.2 = 25$ $\frac{1.2}{75} = \frac{0.4}{x}$ $8x - 0.36×2 = 0.08$
$8x÷\frac{1}{2} = \frac{3}{5}$ $75\%x - \frac{1}{4}x = 9$ $\frac{5}{9} + \frac{1}{4}x = \frac{2}{3}$
$4:x = \frac{2}{3}:6$ $6 = (10 + x):2$ $(4.5 + x):8 = \frac{3}{2}$
答案
$x=32$ $x=80$ $x=0.675$
$x=0.15$ $x=16$ $x=1.8$
$x=\frac{19}{40}$ $x=25$ $x=0.1$
$x=\frac{3}{80}$ $x=18$ $x=\frac{4}{9}$
$x=36$ $x=2$ $x=7.5$
$x=0.15$ $x=16$ $x=1.8$
$x=\frac{19}{40}$ $x=25$ $x=0.1$
$x=\frac{3}{80}$ $x=18$ $x=\frac{4}{9}$
$x=36$ $x=2$ $x=7.5$
