1) ∠A = ∠C = 214 : 2 = 107°
Сумма углов параллелограмма = 360°
∠B = ∠D = (360° - 214°) / 2 = 73°
Ответ: 107°, 73°, 107°, 73°.
2) ∠A + ∠B = 180°
∠A - ∠B = 112°
Решаем как систему (∠A = x, ∠B = y):
x + y = 180
x - y = 112
2x = 292
y = 180 - x
x = 146
y = 34
∠A = ∠C = 146°
∠B = ∠D = 34°
Ответ: 146°, 34°, 146°, 34°
39180÷30×22+6459×10×6=416272
4929*132-39123+139*12:6*10= 614285
<span><span>1.
</span>4929*132=650628</span>
<span><span>2.
</span>139*12=1668</span><span><span>
3.
</span>1668:6=278</span><span><span>
4.
</span>278*10=2780</span><span><span>
5.
</span>650628-39123=611505
</span><span><span>6.
</span>611505+2780= 614285</span>
(107*13+7069)*9-9934+14298=80504
<span><span>
1.
</span>107*13=1391</span>
<span><span>2.
</span>1391+7069=8460</span><span><span>
3.
</span>8460*9=76140</span><span><span>
4.
</span>76140-9934=66206</span>
<span><span>5.
</span>66206+14298</span>
<span><span>6.
</span>66206+14298=80504</span>
3/20 сахара - 1 свекла
12 т сахара - ?
Решаем пропорцию:
1*12:3/20=12*20/3=80 т свеклы