0123456789 can be composed of several 6 digits

10×9×8×7×6×5÷5÷4÷3÷2÷1＝1260

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1. 0123456789 consists of 4 digits It's the one with the phone code. If I can, I'll give it 100 points.
2. In the four corners formed by the intersection of two straight lines, the following statement is correct A. There must be an acute angle B. there must be an obtuse angle C. There must be a right angle d. There must be a non obtuse angle
3. Seven grade mathematics choice question! Urgent! Urgent! If the lengths of three sides of a triangle are a, B, x, and a Single choice
4. (about plane rectangular coordinate system) On the problem of plane rectangular coordinate system The following statement is true: A point that doesn't belong to any quadrant is not on the axis, it's at the origin B the abscissa and ordinate are exchanged to represent another point The point with negative abscissa of C is in quadrant two or three The point whose D ordinate is less than 0 must be below the x-axis But I think B is wrong. It should be d,
5. Given A-B = - 3, C + D = 2, then the value of (B + C) - (A-D) is () A. 1B. 5C. -5D. -1
6. Simplify | C-A | + | C-B | + | a + B|
7. As shown in the figure, AC: CD: DB = 2:3:4, if e is the midpoint of AC, f is dB The distance between the midpoint, e and F is 5.4cm
8. (a-b) - (- C-D) =? This question is about removing brackets
9. Fill in the blanks of mathematics in grade one of junior high school 1. Fill in the basis of deformation in brackets: (a + b) + C = a + (B + C) () = (B + C) + a() Mathematics choice in grade one of junior high school 1. If M is a rational number, then the result of M + | m | must be(). (A) Positive number (B) Negative number (C) Non positive number (D) Nonnegative number
10. To add brackets to polynomial A-B + C-D, the following addition method is wrong A、(a-b)+(c-d) B、(a+c)-(b+d) C、(a-d)+(b-c) D、 a-(b-c+d)
11. How many different 6-digit combinations can 0123456789 form
12. Fill in the nine brackets of the following three formulas with the nine numbers 1.2.3.9 to make the formula true （）+（）=（）（）-（）=（）（）*（）=（）
13. Fill in "+" - "×" "or" () "between the numbers to make the formula true. 33 = 0
14. The meaning of decimal division is the same as that of integer division, that is to say, two factors are known______ And one of the factors______ It's a simple operation
15. (1) The meaning of fractional division is the same as that of integer division, that is, given: (-), the operation of finding another factor (2) 3 / 11 / 3 = 11 / 11 () 0 () = () 0 (); you can also think like this: 9 / 11 is divided into 3 parts averagely, each part is 9 / 11 (), that is 9 / 11 = () 0 () = () () 0 () = 9 / 11 () (3) A fraction divided by an integer is equal to the original fraction multiplied by () (4) It is known that the product of two factors is 15 / 16, one of which is 10. How to find the other factor?
16. The significance and application of fractional division______ They are all known______ And______ , seek______ It's a simple operation
17. The meaning of decimal division is the same as that of integer division, that is to say, two factors are known______ And one of the factors______ It's a simple operation
18. The meaning of decimal division is the same as that of integer division, that is, the operation of () and () of two known factors Reward the right person!
19. Does division of integer and decimal have the same meaning?
20. The significance of decimal division and integer division___ ．