题目
题型:解答题难度:一般来源:不详
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8 |
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答案
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16 |
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8 |
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(2)原式=-4 ×(-
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核心考点
举一反三
(2)计算:(
1×2×4+2×4×8+…+n×2n×4n |
1×3×9+2×6×18+…+n×3n×9n |
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4 |
(2)-12+3÷
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(2)-72+2×(-3)2+(-6)÷(-3)2;
(3)14-
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6 |
(4)2x2-{-3x+[4x2-(3x2-x)]}.
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5 |
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8 |
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5 |
16 |
5 |
8 |
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1×2×4+2×4×8+…+n×2n×4n |
1×3×9+2×6×18+…+n×3n×9n |
1 |
4 |
1 |
2 |
1 |
6 |