15.解比例和方程.
5.4+2x=8.6
$\frac{1}{3}$:$\frac{1}{20}$=1$\frac{7}{9}$:x
$\frac{10}{x}$=$\frac{2.5}{0.8}$.
5.4+2x=8.6
$\frac{1}{3}$:$\frac{1}{20}$=1$\frac{7}{9}$:x
$\frac{10}{x}$=$\frac{2.5}{0.8}$.
14.
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直接写出得数. 0.6÷0.15= | 0.4÷40%= | 5.47-1.8-3.2= | 0.42-0.32= |
0.25:1.75= | 24×$\frac{3}{4}$= | $\frac{3}{7}$÷3= | 12×($\frac{1}{4}$+$\frac{1}{6}$)= |