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（1）选修4-2：矩阵与变换 已知向量 1 -1 在矩阵 M= 1 m 0 1 变换下得到的向量是 0 -1 ． （Ⅰ）求m的值； （Ⅱ）求曲线y 2 -x+y=0在矩阵M -1 对应的线性变换作用下得到的曲线方程． （2）选修4-4：极坐标与参数方程 在直角坐标平面内，以坐标原点O为极点，x轴的非负半轴为极轴建立极坐标系．已知点M的极坐标为 (4 2 ， π 4 ) ，曲线C的参数方程为 x=1+ 2 cosα y= 2 sinα （α为参数）． （Ⅰ）求直线OM的直角坐标方程； （Ⅱ）求点M到曲线C上的点的距离的最小值． （3）选修4-5：不等式选讲 设实数a，b满足2a+b=9． （Ⅰ）若|9-b|+|a|＜3，求a的取值范围； （Ⅱ）若a，b＞0，且z=a 2 b，求z的最大值．
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The man thinks the hat fit well with the shoes, and he likes it.
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B.
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C.
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