计算：|1-2|-sin30°•（12）-2-18．-数学

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• 解方程（1）（x+3）2=（1-2x）2（2）3x（x-1）=2-2x（3）(13)-1-|-2+3tan45°|+(2-1.41)0（4）4sin30°+23cos30°+tan45°．-数学
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