是
，这个数是（）．
，那么三角形的底边长
A． | B． | C．1 | D．不存在 |
A． |
B． |
C． |
D． |
A．630÷  | B．630× | C．630× | D．630÷ |
 = |  ÷  = | 8﹣  = | 6×  = |
 ÷  = |  ﹣ = |  × = |  = |
 ÷3= |  = | +  ×  = |  ×4×  = |
 ×0= | ÷  = |  ×75%= |  = |
÷3，下面算式中不正确的是（ ）| A．×3 |
| B．×8÷（3×8） |
C．×  |
D． |
÷ 
﹣ 
． 
=
÷ ﹣ = 
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