Yucai Middle School Grade 8 Volume 1 mathematics Chapter 2 real number

Yucai Middle School Grade 8 Volume 1 mathematics Chapter 2 real number

1、 Multiple choice questions
1. In real number 0.3, 0,..., 0.123456 Where the number of irrational numbers is ()
A.2 B.3 C.4 D.5
2. The result of simplification is ()
A. - 4 b.4 C. ± 4 d. meaningless
3. In the following forms, the meaningless one is ()
A.B.C.D.
4. If + is meaningful, then the value of the algebraic formula | X-1 | + is ()
A.±8 B.8
C. It has nothing to do with the value of X
5. In RT △ ABC, the result of simplifying - 2 | C-A-B | is ()
A.3a+b－c B.－a－3b+3c
C.a+3b－3c D.2a
6.4, 15 are ()
A.4