Li Hong's family saved 33.6 yuan in water and electricity in the first half of the year, while Wang Fang's family saved 24.3 yuan in the first quarter

Li Hong's family saved 33.6 yuan in water and electricity in the first half of the year, while Wang Fang's family saved 24.3 yuan in the first quarter

Analysis: compare by month
Li Hongjia 33.6 △ 6 = 5.6 (yuan)
Wang Fangjia 24.3 △ 3 = 8.1 (yuan)
A: the average water and electricity cost saved by Wang Fang's family is more than 8.1 yuan per month

An enterprise produces three kinds of ABC products, the water and electricity cost of the workshop is 2000 yuan, the machine repair cost is 1000 yuan, the salary of the workshop manager is 2000 yuan, the other costs are 1000 yuan, and the total production time is 500 hours, among which the three kinds of ABC products consume 200 hours, 200 hours and 100 hours respectively, Write down the entry of carry over indirect expenses

1. The total indirect cost of this month is 2000 + 1000 + 2000 + 1000 = 60002. The distribution rate of indirect cost borne by three products is 6000 / (200 + 200 + 100) = 12. The indirect cost borne by a product is 200 * 12 = 2400. The indirect cost borne by B product is 200 * 12 = 2400. The indirect cost borne by C product is 100 * 12 = 120

If 500 yuan deposited in the bank is recorded as + 500 yuan, then 200 yuan for water and electricity should be recorded as - 200 yuan___ (judge right or wrong)

If 500 yuan deposited in the bank is recorded as + 500 yuan, then 200 yuan should be recorded as - 200 yuan

A person deposits 2000 yuan into the bank on a one-year basis, withdraws 1000 yuan for shopping after maturity, and deposits the remaining 1000 yuan and the interest due to him in the bank on a one-year basis. If the interest rate of the deposit remains unchanged, he will get 1320 yuan of principal and interest after maturity, and calculate the annual interest rate of this deposit method

Let the annual interest rate of this kind of deposit be X. from the meaning of the question, we can get [2000 (1 + x) - 1000] (1 + x) = 1320, and the solution is: X1 = - 1.6 (not conforming to the meaning of the question, rounding off), x2 = 0.1, and the annual interest rate of this kind of deposit is: 0.1 = 10%

Math problem! Solving! Online, etc! Y = 9 (x + 2) ^ 2 - 2
Find the range of this formula!! thank you very much!!

(y+2)/9=(x+2)²>=0
y+2>=0
y>=-2

25×64×75

25×64×75
=25×4×4×4×25×3
=100×4×100×3
=120000

+0.75+-2.8+-0.2-1.

（+0.75）+（-2.8）+（-0.2）-1.25
=0.75-1.25-(0.28+0.2)
=-0.5-0.3
=-0.8
If you don't understand, you are welcome to ask,

Math 25% x + 20% = 0.65
It's not consistent with the standard answer

The answer is: 1.8
In fact, as long as we regard it as: 0.25x + 0.2 = 0.65, and then we can use some mathematical knowledge
General these problem algorithm is such, want to do more a few, be familiar with, won't old calculate inaccurate! Come on

As shown in the figure, in RT △ ABC, ab = AC, ∠ BAC = 90 °, ∠ 1 = ∠ 2, CE ⊥ BD is extended to E. verification: BD = 2ce

As shown in the figure, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\bac = ∠ facab= AC，∴△ADB≌△AFC（AAS），∴BD=FC，∴BD=2CE．

Mathematics problem solving in Grade 8 √ 2 (√ 2 + 1 / √ 2) - √ 18 - √ 8 / √ 2

√2(√2+1/√2)-√18-√8/√2
=2+1-3√2-2
=1-3√2