Current location - Training Enrollment Network - Mathematics courses - People's education edition, the second volume of the second grade, mathematics scores, multiplication, division, addition and subtraction exercises. (Just calculating the problem or simplifying the to
People's education edition, the second volume of the second grade, mathematics scores, multiplication, division, addition and subtraction exercises. (Just calculating the problem or simplifying the to
People's education edition, the second volume of the second grade, mathematics scores, multiplication, division, addition and subtraction exercises. (Just calculating the problem or simplifying the topic of evaluation. ) 1, simplification++equals ()

A.B. C. D。

2. Calculate+-to get ()

A. 2nd century BC

3. Calculate a-b+ ()

A.b a+b c d a-b

4. If =+,then m =.

5. When the value of the fraction-is equal to zero, then x =.

6. If a>b>0, the sign of the-value is.

7. Given that A+B = 3, AB = 1, the value of+is equal to.

8. (Error-prone) Calculation:-.

9. (Error-prone) Calculation: -X- 1.

10, simplify first and then evaluate:-+,where a =.

1 1. As we all know, the distance between A and B is S kilometers. It takes M hours for Wang Gang to go from A to B, and N hours for Zhao Jun to go from B to A.. When will they meet?

12, (open question) Two scores are known: A =, B =+, where X ≠ 2. There are three conclusions as follows: ① A = B; ②A-B = 0; ③ A+B = 0。 Which one is correct? Why?