#971 и 974 и 975 срешением пожалуйста

Question 1

Question 2

Номер 971.
1)
$(15.2 - 4.8 \times (150 \times 0.1 \times 0.1 + 1.56)) \times 40 - 0.2 \times ( - 0.2) \times 60 \times 60 \times 0.5 \times 0.5 \times 0.5 = \\ = (15.2 - 4.8 \times 3.06) \times 40 + 0.4 \times 3600 \times 0.25 \times 0.5 = \\ = 0.512 \times 40 + 180 = 20.48 + 180 = 200.48$
2)
$10.697 + (0.6 \times 0.6 + 0.8 \times 0.8)(0.6 \times 0.6 + 0.8 \times 0.8)(0.6 \times 0.6 + 0.8 \times 0.8) \times ((3.78 + 16.3)(3.78 + 16.3) - 12.9 \times 0.016) \div 1000 = \\ = 10.697 +0.2304 \times 0.2304 \times 0.2304 \times (20.08 \times 20.08 - 0.2064) \div 1000 = \\ = 10.697 + 0.0122305905 \times 403 \div 1000 = \\ = 10.697 + 0.004928928 = 10.701928928 \:$
Номер 974.
1)
$x \times (3.6 - 0.6) = 4 \times 3.6 - 4y \\ 3.6x - 0.6x = 14.4 - 4y \\ 3x = 14.4 - 4y$
Равенство равно при
$x = 0.8\\ y = 3$
2)
$0.7(5 + x) = y + 0.14 \\ 3.5 + 0.7x = y + 0.14 \\ 0.7x - y = 0.14 - 3.5 \\ 0.7x - y = - 3.36 \\$
Равенство равно при: когда 0.7х<у<br>
3)
$(x + 4.1) \times 0.2 = 1.6 + y \\ 0.2x + 0.82 = 1.6 + y \\ 0.2x - y = 1.6 - 0.82 \\ 0.2x - y = 0.78 \\$
Равенство равно при: когда 0.2х>у

4)
$(9 - x) \times y = 4.5 - 0.35 \\ 9y - xy = 4.15 \\$
Равенство равно при: когда 9у>ху
Номер 975.
1)
$0.8 \times 20 = 16$
2)
$0.6 \times 12 = 7.2$
3)
$0.05 \times 80 = 4$
4)
$0.15 \times 4 = 0.6$
5)
$0.01 \times 0.9 = 0.009$
6)
$0.1 \times 17 = 1.7$
7)
$0.4 \times 60 = 24$
8)
$0.5 \times 0.2 = 0.1$