Решение во вложении -------------------------------------
1001 делится на 7 да. на 11 тоже ,и на 13 тоже
1)
20+5 = 25
25-3 = 22
22+5 = 27
27-3 = 24
24+5 = 29
2)
2^{2021} = 2^{2019+2} = 2^{2}·2^{2019} = 4m
3)
x = -27, y = -37
x-y = -27-(-37) = -27+37 = 10
4)
5^2 = 25
1)√2у-3/2*4√2у+6*2/3√2у=√2у-6√2у+6√2у=√2у
2)a-√ab+3√√ab-3b=a-3b+2√ab
3)6√x-2/3*3√√x+10*1/2√x=6√x-2√x+5√x=9√x
4)√a+1