An applied problem of a system of linear inequalities in elementary two variables Cement is transported by several 8-ton trucks. If each truck is loaded with 4 tons, then 20 tons of cement is left. If each truck is loaded with 8 tons, then the last truck is not empty. To find out the quantity of cars and cement, we need to list a one yuan inequality system

An applied problem of a system of linear inequalities in elementary two variables Cement is transported by several 8-ton trucks. If each truck is loaded with 4 tons, then 20 tons of cement is left. If each truck is loaded with 8 tons, then the last truck is not empty. To find out the quantity of cars and cement, we need to list a one yuan inequality system

Vehicle x, cement y tons
According to the meaning of the title:
4x+20=y
0

A system of inequalities of degree one in elementary two
Xiao Ming accidentally missed the index of X when he copied the problem of decomposing fractions. He only knows that the number is not more than 10 integers, and can use the square difference formula to decompose. The formula copied in the exercise book is the square of x ^ - 4Y (^ represents the missing index). Please help Xiao Ming find out the possible result of this index

As long as the exponent is greater than zero, is an integer, and is even, less than or equal to 10
Such as 2, 4, 6, 8, 10, if it is 4, 8, it can also be decomposed

Let a and B be the two right sides of a right triangle. If the perimeter of the triangle is 6 and the length of the hypotenuse is 2.5, then the value of AB is ()
A. 1.5B. 2C. 2.5D. 3

The perimeter of ∵ triangle is 6, the length of hypotenuse is 2.5, ∵ a + B + 2.5 = 6, ∵ a + B = 3.5, ① ∵ A and B are the two right sides of right triangle, ∵ A2 + B2 = 2.52, ② AB = 3 can be obtained from ① and ②, so D

1、 Write words as required 1. Heavy adverb 2. Rain adjective 3. Too synonym 4. Happy adjective 5. Afaid antonym
2、 Fill in the blanks with the proper form of the words given
move rain happy be heavy watch
Kelly,how is the weather tomorrow?----Let's __ the weather on TV.
2.The wild geese__ home twice every year.
3.It will___ fine tomorrow.
4.The box is very__ .I can't bring it.
5.The girls dance___ in the hall.
6.Today is__ .Please take an umbrella with you.Tom .
3、 Fill in the blanks every other word
People keep their money here.It is a___ .
2.We can know the weather on__ .
3.Many old people__ happily in the park.
4.The wind is blowing___ .The children are flying kites.
5.Sweets are___ for children's teeth.
4、 Change sentences
Can we go out now
2. The wind is blogging (gently)
We have some heavy rain and a strong wind
4. Let's watch the weather on TV

1、 Write words as required: 1. Heavy adverb heavy 2. Rain adjective rain 3. Too synonym also 4. Happy adjective happy 5. Opposite word unafraid 2. Fill in the blanks with the proper form of the given words: move rain happy be heavy watch 1. Kelly, how is the weather

A topic about sine and cosine theorem
In triangle ABC, Tana △ tanb = [(radical 2) × C-B] △ B, how many degrees is angle a?
The answer is 45 degrees

sinAcosB/cosAsinB=[(√2)sinC-sinB]/sinBsinAcosB=[(√2)sinC-sinB]cosA=(√2)sinCcosA-sinBcosAsinAcosB+cosAsinB=(√2)sinCcosAsin(A+B)=(√2)sinCcosA=sinC(√2)cosA=1cosA=√2/2A=45`

Is the verb after be in the form of ing

of course

How to understand the progressiveness and tortuousness of the development of things in the law of negation of negation? What is the practical significance for socialist construction?

The negation of negation is affirmation first, then negation, and finally negation, which is equal to affirmation. Such affirmation is different from the initial affirmation, but it is essentially the same, and it is the reinforcement of affirmation. In this process, the two negations represent the tortuousness of the development of things, and the final affirmation represents the progressiveness of the development of things

Singular and plural nouns
How to change a verb into a single three person
What is the general rule of plural nouns?
I'm sorry,_______ I can't go to the movies with you.
A. Why? I always think it's a?
Is going a present participle? Is going a present participle or something?

1. Most verbs end with - s, listens, talks, tells, sees, etc
2. For verbs ending with s, x, SH, CH, add - es, such as: teachers, wishes; passes, fixed
Etc
3. For those ending with a consonant letter and y, change y into I and then add es, such as: carry -- carries study -- studies, etc
There are a few irregular changes that need to be remembered individually
Plural nouns are also the rules, but we should also pay attention to the irregular situation
I'm sorry, (but) I can't go to the movies with you
Going, doing, etc. are the present participle forms

Let the inner angles a, B and C of △ ABC opposite edges a, B and C respectively, and acosb-bcosa = 1 / 2C
Let the inner angles a, B and C of △ ABC face a, B and C respectively, and acosb-bcosa = 1 / 2C
(1) Find the value of Tana / tanb
(2) When Tan (a-b) is the maximum, the shape of △ ABC is judged

1. A / Sina = B / SINB = C / sinc, so C = asinc / Sina = asin (a + b) / Sina = a (sinacosb + cosasinb) / Sina. Substituting this formula into the known formula, we get that asinacosb acosasinb = 2bsinacosa, because a / Sina = B / SINB, so sinacosb = 3sinbcosa, that is, Tana / tanb = 32, Tan (a-b) =

Peter's father bought him a pair of sports shoes yesterday__ a pair of sports shoes yesterday

bought him