计算下列各题: (1)(﹣4a5b3)2÷(8a2b3)(2)(x+2)2﹣(x+3)(x﹣3)(3)[(2x+1)(4x+2)﹣2]÷(8x)(4)已知x+y
题型:解答题难度:一般来源:山东省期中题
计算下列各题: (1)(﹣4a5b3)2÷(8a2b3) (2)(x+2)2﹣(x+3)(x﹣3) (3)[(2x+1)(4x+2)﹣2]÷(8x) (4)已知x+y=10,xy=24,求x2+y2的值 |
答案
解: (1)(﹣4a5b3)2÷(8a2b3) =16a10b6÷8a2b3, =2a8b3; (2)(x+2)2﹣(x+3)(x﹣3), =x2+4x+4﹣x2+9, =4x+13; (3)[(2x+1)(4x+2)﹣2]÷(8x), =(8x2+8x+2﹣2)÷8x, =(8x2+8x)÷8x, =x+1. (4)当x+y=10,xy=24时 ,x2+y2 =(x+y)2﹣2xy, =102﹣2×24 ,=100﹣48, =52. |
举一反三
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