Помогите, пожалуйста, срочно

Задание 1.

$1000a {}^{9}b {}^{6} = (10a {}^{3}b {}^{2}) {}^{3}$

Задание 2.

$15a {}^{2} b \times 25ab {}^{2} = 375a {}^{3} b {}^{3}$

при а = 0,25; b = 4

$375 \times (0.25) {}^{3} \times 4 {}^{3} = \\ = 375 \times 0.015625 \times 64 = \\ = 375$

Задание 3.

$2.4 \times 10 {}^{3} + 1.2 \times 10 {}^{2} = 24 \times 10 {}^{2} + 1.2 \times 10 {}^{2} = 10 {}^{2} \times (24 + 1.2) = 25.2 \times 10 {}^{2} = 2.52 \times 10 {}^{3} \\\\ 2.4 \times 10 {}^{3} - 1.2 \times 10 {}^{2} = 24 \times 10 {}^{2} - 1.2 \times 10 {}^{2} = 10 {}^{2} \times (24 - 1.2) = 22.8 \times 10 {}^{2} = 2.28 \times 10 {}^{3} \\ \\ 2.4 \times 10 {}^{3} \times 1.2 \times 10 {}^{2} = 2.4 \times 1.2 \times 10 {}^{2 + 3} = 2.88 \times 10 {}^{5} \\ \\ \frac{2.4 \times 10 {}^{3} }{1.2 \times 10 {}^{2} } = \frac{2 \times 10}{1} = 20$

Помогите, пожалуйста, срочно​

Помогите, пожалуйста, срочно