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1. 直接写出得数。
$8-\dfrac{2}{5}=$
$\dfrac{3}{10}+0.3=$
$\dfrac{2}{3}+\dfrac{1}{5}-\dfrac{2}{3}+\dfrac{1}{5}=$
$8÷ 0.4=$
$\dfrac{5}{12}+\dfrac{1}{12}=$
$\dfrac{7}{3}+\dfrac{2}{3}=$
$1-\dfrac{3}{4}=$
$0.6^2=$
$2.8÷ 0.14=$
$7÷ 0.01=$
$0.9× 0.08=$
$10× 10× 10=$
$8-\dfrac{2}{5}=$
$\dfrac{3}{10}+0.3=$
$\dfrac{2}{3}+\dfrac{1}{5}-\dfrac{2}{3}+\dfrac{1}{5}=$
$8÷ 0.4=$
$\dfrac{5}{12}+\dfrac{1}{12}=$
$\dfrac{7}{3}+\dfrac{2}{3}=$
$1-\dfrac{3}{4}=$
$0.6^2=$
$2.8÷ 0.14=$
$7÷ 0.01=$
$0.9× 0.08=$
$10× 10× 10=$
答案
1.$7\dfrac{3}{5}$ 0.6 $\dfrac{2}{5}$ 20 $\dfrac{1}{2}$ 3 $\dfrac{1}{4}$ 0.36 20 700 0.072 1000
2. 怎样简便就怎样算。
$2-\frac{1}{4}-\frac{1}{3}-\frac{3}{4}$
$15-5÷12-\frac{7}{12}$
$\frac{7}{13}+\frac{2}{7}+\frac{4}{7}+\frac{6}{13}$
$5.79+\frac{3}{7}+4.21+\frac{4}{7}$
$2-\frac{1}{4}-\frac{1}{3}-\frac{3}{4}$
$15-5÷12-\frac{7}{12}$
$\frac{7}{13}+\frac{2}{7}+\frac{4}{7}+\frac{6}{13}$
$5.79+\frac{3}{7}+4.21+\frac{4}{7}$
答案
2.$\dfrac{2}{3}$ 14 $1\dfrac{6}{7}$ 11
3. 列竖式计算。（除不尽的保留两位小数）
$407×8$
$3.9×3.04$
$8.02÷5.6$
$407×8$
$3.9×3.04$
$8.02÷5.6$
答案
3.(竖式略)$=3256$ $=11.856$ $≈1.43$
4. 解方程。
$x-\dfrac{6}{7}=\dfrac{2}{3}$
$\dfrac{2}{3}-x=\dfrac{2}{9}$
$\dfrac{11}{20}+x=\dfrac{4}{5}$
$x-\dfrac{6}{7}=\dfrac{2}{3}$
$\dfrac{2}{3}-x=\dfrac{2}{9}$
$\dfrac{11}{20}+x=\dfrac{4}{5}$
答案
4.$x=\dfrac{32}{21}$ $x=\dfrac{4}{9}$ $x=\dfrac{1}{4}$
