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The oil import volume of an oil importing and exporting country in recent months has decreased by 15% compared with last month. Due to the rise of international oil price, the cost of oil import in this month has increased by 14% compared with last month. How about the growth rate of oil price in this month compared with last month?
Suppose the imported oil volume of last month is 1 and the imported oil price is y. The imported oil price of this month is X
Then, the amount of imported oil in this month is 0.85, and the cost of imported oil in this month is 0.85x
Due to the rise of international oil prices, the cost of importing oil this month has increased by 14% compared with last month, that is, the cost of importing oil this month = y * 1.14
The result is: 0.85x = 1.14y
Y / X-1 is the growth rate of this month's oil price relative to that of last month
Y/X-1=1.14/0.85-1≈0.34
So this month's oil price is about 34% higher than last month's
A raw material supplier implements the following preferential measures for customers who purchase its raw materials: (1) no discount will be given if the amount of one-time purchase does not exceed 10000 yuan; (2) 10% discount will be given if the amount of one-time purchase exceeds 10000 yuan but does not exceed 30000 yuan; (3) 10% discount will be given if the amount of one-time purchase exceeds 30000 yuan, and 20% discount will be given if the amount of one-time purchase exceeds 30000 yuan The supplier pays 7800 yuan for purchasing raw materials and 26100 yuan for the second purchase. If he purchases the same raw materials at one time, he can pay less ()
A. 1170 yuan B. 1540 yuan C. 1460 yuan D. 2000 yuan
If the second purchase is x yuan, then 90% · x = 26100, the solution is x = 29000. If the second purchase is 29000 + 7800 = 36800, the one-time purchase can reduce the payment by (26100 + 7800) - 30000 × 90% - 6800 × 80% = 1460 yuan
Expand (x2-x + 1) 6 to get a12x12 + a11x11 + A2x2 + a1x1 + A0, then A12 + A10 + A8 + A6 + A4 + A2 + A0=______ ．
∵（x2-x+1）6=a12x12+a11x11+… +When x = 1, (x2-x + 1) 6 = A12 + a11 + +When x = - 1, (x2-x + 1) 6 = a12-a11 + +a2-a1+a0=36=729，②∴①+②=2（a12+a10+a8+a6+a4+a2+a0）=730，∴a12+a10+a8...
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