题目内容
口算：
|
(1)45×20＝ (2)2.6-1.7＝ |
|
(3)60×80＝ (4)13×20＝ |
答案：900;0.9;4800;260
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口算．
|
(1)4 ×6－20= |
(2)34 ＋63÷9= |
(3)81 ÷9×4= |
|
(4)72 ÷8－9= |
(5)15 ＋5×6= |
(6)56 －30＋6= |
|
(7)(26 ＋9)÷7= |
(8)8 ×(35－30)= |
(9)63 ÷(56÷8)= |
口算
 += |  - = |  +- = | 3+ = |
 + = | 1- - = |  + += | 4-= |
=
=
=口算．
1÷ = | 4.8÷2.4= | 9600÷30= | 84%÷4= |
| 52×0.4= | 21.7÷0.7= |  -= |  + = |
| b×0= | 0.73×99+0.73= | 84÷0.7= | 2+1÷3= |