Middle School After School Exercises 6th Grade Middle School Mathematics After School Exercises

Equal because abcd is square, so, fde=45, so, de=ef again because: bef bcf

So, cf = ef

So, de=cf

Junior high school? Sixth grade? Are you a senior in high school?

1. A is between A and B: In this case, the car only walked 10km in 30 minutes, and the speed was 20km h, so it would take him 8 hours to get to B, and he couldn't even get to B before 5 pm, so it was impossible.

2. A is not between A and B: from A to A, to 20km away from A, it takes 30 minutes to walk 30 km, so the speed of the car is 60km h = 1km per minute (30km. The car walked a total of 10 + 150 = 160 km to B place, and the total time was 160 km 1 km minute = 160 minutes = 2 hours and 40 minutes.

In this way, it is already 3:40 p.m. when you get to place B, and there are still 30km to reach place C, which takes 30 minutes, so add 30 minutes, and it will be 4:10, and the answer is to arrive on time and arrive at 4:10.

v=(20-10)/

More than 4h so can't arrive on time.

140/20=7h

Classmate, there is a problem with the question, and when I arrived at place B, it was already 8 o'clock.

One (1) enables people to establish ideals and strive for ideals.

2) Have an idea.

3) All have ideal difficulty.

The first year of junior high school? There are a lot of them in the library. Find a question that suits your level of difficulty. There are comprehensive and thematic ones. Hope.

Middle school starts in the seventh grade.

First: No, after filling in has, it is in the present perfect tense (has +v-ed form), if you don't fill in has, it is in the past tense (v ed form), which is the reason why the question requires you to fill in the sentences in the present perfect tense only in has, in other words, other sentences are wrong if you fill in them.

Second: The simple past tense is what happened in the past, while the present perfect tense emphasizes that what happened in the past still has an impact on the present. Generally since or a large period of time must be completed after the present, and the rest depends on the meaning to decide.

There is an obvious time adverbial hint in the past tense that was made in the past and is easier to tell.

1) She just boiled an egg.

2) Actually, the meaning is similar to 1), the key is that there is one more minute ago, so it must be in the past tense. Actually, 1) can also be in the past tense, but with the addition of the modal word just, it is generally customary to use the present perfect tense.

3) She said she had never been to China, but he went in 1992. She has never been, she hasn't been until now, and it has an impact on the current situation, so she uses the present perfect tense. (And there is a been there, if there is a past tense, it can only be written that she never went to China).

4) He's repainted his bookcase. It also has an effect on the present, and there is an already, just like the first question, which is a hint of using the emotional word in the present perfect tense.

5) He whitewashed his bookcase a week ago. The key is to clarify the past time expression, so use the past tense.

6) Looks like you've mistyped a word that starts with m, so you can't explain it. Appears this morning (indicating that it is no longer morning, or a clear time in the past), so use the past tense.

7) Just doesn't need to say much when he sees it, it must be when it's finished Meaning, he just finished cleaning his cupboard.

Summary,In fact, after reading more, it is easy to judge that it appears when it is completed (junior high school level),There will be some word prompts that indicate the tone before and after.,You have to remember to be good at summarizing.。