With the improvement of the standard of living, the 3 environmental protection requirements are also higher and higher, Xiaoshan District, there is a chemical plant in the original monthly profits for

With the improvement of the standard of living, the 3 environmental protection requirements are also higher and higher, Xiaoshan District, there is a chemical plant in the original monthly profits for it 200,000 yuan. From this year (nine) y=xw=x (nine x+8) = nine x2+8 x (nine points)

When nine x2+8 x=8 ten (nine points)

Solution tx=6, x=-90 (rounding) (2 points, no rounding deduction of nine points)

Answer: the first 6 June profits and equal to 8 ten million yuan;

(2) nine x2 + 8 had x = nine 2 had x (2 points)

Solution tx = ten, x = had (rounded) ((2 points, no rounding deduction of nine points)

Answer: when x is ten,

the use of recycling and purification equipment, the sum of the profits of the nine-x months after

and the sum of the profits of the six-month period without the installation of recycling and purification equipment x is equal.

(3) Nine 2 (nine x nine 2 + 8) + nine 2 [nine 2 (nine x nine 2 + 8) - nine 9 (nine x nine 9 + 8)] = 6 nine 2 (million yuan) (2 points)

Therefore, the sum of the profits of the two years after the use of recycling and purification equipment is 6 nine 2 million yuan.