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一、口算。
$0.64× 0.3=$
$\frac{1}{4}-\frac{2}{15}=$
$32.3× 4× 25=$
$24÷ 40=$
$\frac{9}{20}÷ \frac{3}{10}=$
$3.7+4.6+3.3=$
$\frac{15}{19}÷ \frac{5}{38}=$
$\frac{48}{25}× \frac{5}{6}=$
$7.9× 101-7.9=$
$\frac{3}{8}+\frac{2}{3}=$
$7.54-6.45=$
$5.8-3.2÷ 0.8=$
$\frac{3}{5}-\frac{1}{45}=$
$\frac{7}{8}× \frac{3}{28}=$
$92\%÷ \frac{1}{5}÷ \frac{1}{2}=$
$10÷ \frac{4}{9}=$
$0.48+0.3=$
$7× \frac{1}{10}+7× \frac{9}{10}=$
$1-37\%=$
$3.14× 6=$
$\frac{9}{7}-(\frac{1}{3}+\frac{2}{7})=$
$0.64× 0.3=$
0.192
$\frac{1}{4}-\frac{2}{15}=$
$\dfrac{7}{60}$
$32.3× 4× 25=$
3230
$24÷ 40=$
0.6
$\frac{9}{20}÷ \frac{3}{10}=$
$\dfrac{3}{2}$
$3.7+4.6+3.3=$
11.6
$\frac{15}{19}÷ \frac{5}{38}=$
6
$\frac{48}{25}× \frac{5}{6}=$
$\dfrac{8}{5}$
$7.9× 101-7.9=$
790
$\frac{3}{8}+\frac{2}{3}=$
$\dfrac{25}{24}$
$7.54-6.45=$
1.09
$5.8-3.2÷ 0.8=$
1.8
$\frac{3}{5}-\frac{1}{45}=$
$\dfrac{26}{45}$
$\dfrac{3}{32}$
$\frac{7}{8}× \frac{3}{28}=$
9.2
$92\%÷ \frac{1}{5}÷ \frac{1}{2}=$
$\dfrac{45}{2}$
$10÷ \frac{4}{9}=$
0.78
$0.48+0.3=$
7
$7× \frac{1}{10}+7× \frac{9}{10}=$
0.63
$1-37\%=$
18.84
$3.14× 6=$
$\dfrac{2}{3}$
$\frac{9}{7}-(\frac{1}{3}+\frac{2}{7})=$
答案
周四
一、0.192 $\dfrac{7}{60}$ 3230
0.6 $\dfrac{3}{2}$ 11.6
6 $\dfrac{8}{5}$ 790
$\dfrac{25}{24}$ 1.09 1.8
$\dfrac{26}{45}$ $\dfrac{3}{32}$ 9.2
$\dfrac{45}{2}$ 0.78 7
0.63 18.84 $\dfrac{2}{3}$
一、0.192 $\dfrac{7}{60}$ 3230
0.6 $\dfrac{3}{2}$ 11.6
6 $\dfrac{8}{5}$ 790
$\dfrac{25}{24}$ 1.09 1.8
$\dfrac{26}{45}$ $\dfrac{3}{32}$ 9.2
$\dfrac{45}{2}$ 0.78 7
0.63 18.84 $\dfrac{2}{3}$
二、求未知角的度数。
答案
二、$∠ 1 = 180^{\circ} - [180^{\circ} - 60^{\circ} - (180^{\circ} - 135^{\circ})] = 105^{\circ}$
$∠ 2 = 180^{\circ} - (180^{\circ} - 70^{\circ}) = 70^{\circ}$
$∠ 2 = 180^{\circ} - (180^{\circ} - 70^{\circ}) = 70^{\circ}$
