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Several questions in the first volume of the first grade of mathematics, thank you, thank you, thank you.
1.2 1000*4/7= 12000

2.750-600= 150

3.3A-2= 1，A= 1，6* 1+B=0，B=-6 A+B=-5

4.65'

5.a12.5km b10km

6.A'=-3，B=- 1/3，A+B=-8/3

7 exchange method; Association law; Distribution law of multiplication to addition

8.130 =1.3 * 1021.3 times the quadratic power of10.

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