题目内容
计算:1.992-1.98×1.99+0.992得( )
| A.0 | B.1 | C.8.8804 | D.3.9601 |
1.992-1.98×1.99+0.992,
=1.992-2×0.99×1.99+0.992,
=(1.99-0.99)2,
=1.
故选B.
=1.992-2×0.99×1.99+0.992,
=(1.99-0.99)2,
=1.
故选B.
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