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The answer to the midterm examination paper of the second volume of mathematics in seventh grade.
1. Multiple choice questions: (2 points for each small question, * * * 20 points)

1.

The arithmetic square root of is (

)

A.4

B.iv.

C.2

D.2

2. if a‖b,

British Columbia,

D⊥a, and then (

)

A.b⊥d

B.a⊥c

c . b . d

Washington D.C.

3. As shown in the figure, simplify:-

+|b+a- 1|(

)

A. 1

B. 1-2b-2a

C.2a-2b+ 1

D.2a+2b- 1

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