题目内容
x1,x2,x3,x4,x5,x6都是正数,且
=1,
=2,
=3,
=4,
=6,
=9,则x1x2x3x4x5x6= .
| x2x3x4x5x6 |
| x1 |
| x1x3x4x5x6 |
| x2 |
| x1x2x4x5x6 |
| x3 |
| x1x2x3x5x6 |
| x4 |
| x1x2x3x4x6 |
| x5 |
| x1x2x3x4x5 |
| x6 |
考点:整式的混合运算
专题:整体思想
分析:六个等式左右两边相乘,开四次方即可求出所求式子的值.
解答:解:∵
=1,
=2,
=3,
=4,
=6,
=9,
∴
•
•
•
•
•
=1×2×3×4×6×9,
整理得:(x1x2x3x4x5x6)4=2×2×2×2×3×3×3×3=(2×3)4=64,
则x1x2x3x4x5x6=6.
故答案为:6.
| x2x3x4x5x6 |
| x1 |
| x1x3x4x5x6 |
| x2 |
| x1x2x4x5x6 |
| x3 |
| x1x2x3x5x6 |
| x4 |
| x1x2x3x4x6 |
| x5 |
| x1x2x3x4x5 |
| x6 |
∴
| x2x3x4x5x6 |
| x1 |
| x1x3x4x5x6 |
| x2 |
| x1x2x4x5x6 |
| x3 |
| x1x2x3x5x6 |
| x4 |
| x1x2x3x4x6 |
| x5 |
| x1x2x3x4x5 |
| x6 |
整理得:(x1x2x3x4x5x6)4=2×2×2×2×3×3×3×3=(2×3)4=64,
则x1x2x3x4x5x6=6.
故答案为:6.
点评:此题考查了整式的混合运算,熟练掌握运算法则是解本题的关键.
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