Junjun paid 45.6 yuan for one kilogram of sugar and three kilogram of biscuits. Congcong paid 21.6 yuan for the same kilogram of sugar and biscuits. How much is each kilogram of sugar and biscuits?

(45.6-21.6) / (3-1) = 12 yuan. This is a biscuit
21.6-12 = 9.6 yuan. This is sugar

Calculation: 18.25 × 1145 − 1714 △ (1 − 5459)=______ ．

25 × 1145 − 1714 △ (1 − 5459) = 1814 × 1145-1714 × 1145, = (1814-1714) × 1145, = 1 × 1145, = 1145

Sequence - 1, 85, - 157249 A general formula of is ()
A. an=（-1）nn3+n2n+1B. an=（-1）nn(n+3)2n+1C. an=（-1）n(n+1)2−12n−1D. an=（-1）nn(n+2)2n+1

Because this is a multiple-choice question, we can use the special value method to solve it. Take n = 1 and substitute it. We find that only the answer D holds, so we choose D

What is the intersection line of a sphere cut by a plane?

Circle

Can you still use the solid sodium acetate made of water and ice

OK, because the principle of this experiment is supersaturation. Anyway, you also need to prepare saturated solution at high temperature, cool down to supersaturation, heat and evaporate water, so it doesn't matter

Calculation formula of water pressure value: C of P + ρ GZ + (1 / 2) * ρ V ^ 2 = C in Bernoulli equation
Where C is a constant. What is the constant?

Bernoulli equation includes: position head, pressure head, and energy (velocity) head. C in the formula is constant, which means that when there is no energy input or output in fluid flow, the sum of the three is equal on the section

If the sum of the maximum and minimum values of the function f (x) = a ^ x + log a (x + 1) on [0,1] is a, then the value of a is a

Do you need a solution,

Of the following points in both the eastern and northern hemispheres is ()
A. 30W, 30n B. 10W, 10N C. 170E, 30s D. 175e, 10N

According to the division of the northern and southern hemispheres and the northern and southern latitudes, the equator is the boundary. The latitude to the north of the equator is called the northern latitude, which is indicated by the symbol "n", and belongs to the northern hemisphere. The latitude to the south of the equator is called the southern latitude, which is indicated by the symbol "s", and belongs to the southern hemisphere. The dividing line between the eastern and western hemispheres is the meridional circle composed of 20 ° W and 160 ° e, with the eastern hemisphere to the east of 20 ° W and the west of 160 ° e, and the eastern hemisphere to the west of 20 ° W and the east of 160 It is known that a, 30 degrees west longitude and 30 degrees north latitude are located in the western and Northern Hemisphere; B, 10 degrees west longitude and 10 degrees north latitude are located in the eastern and Northern Hemisphere; C, 170 degrees east longitude and 30 degrees south latitude are located in the western and southern hemisphere; D, 175 degrees east longitude and 10 degrees north latitude are located in the western and Northern Hemisphere

Column equation solution: the sum of the three continuous even numbers is 42, to find the three continuous even numbers

Let the number in the middle be X. according to the meaning of the question, we can get: (X-2) + X + (x + 2) = 42, and the solution is x = 14

If the equation x square - (n + 2) x + 2n = 0 (1) about X is proved, no matter what value n takes, Fangcheng always has a real root

⊿=(n+2)²-8n
=n²+4n+4-8n
=n²-4n+4
=(n-2)²≥0
Whatever the value of N, Fangcheng always has real roots

Junjun paid 45.6 yuan for one kilogram of sugar and three kilogram of biscuits. Congcong paid 21.6 yuan for the same kilogram of sugar and biscuits. How much is each kilogram of sugar and biscuits?