题目内容
20+9=
[ ]
A.26
B.29
C.74
D.97
答案:B
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| 下面各题怎样简便就怎样计算 9.9×25 | 0.75×0.5×4×0.2 |
| 1.25×32×0.25 | 8.12×4+1.88×4 |
| 0.32×13.4-0.32×3.4 | 3.84×99+3.84 |
| 2.009×390+20.09×41+200.9×2 | (9.57+9.57+9.57+9.57 )×25. |