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In the summer class, every class practices seventh-grade math problem solving.
1.K=7/2 -5/2 has a square root, and k=-5/2 has a square root of plus or minus 2.

2。 ( 1/ 100- 1/ 10000)LG 5.23

3.=a-(a- 1)= 1

4. The power of (quadratic root number 3) 20 1 1 power × 20 12 (quadratic root number 7)

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