有3个完全相同的小球,把它们分别标号为1,2,3,放在一个口袋中,随机地摸出一个小球不放回,再随机地摸出一个小球.
(Ⅰ)采用树形图法(或列表法)列出两次摸球出现的所有可能结果.
(Ⅱ)求摸出的两个球号码之和等于5的概率.
考点分析:
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解不等式组
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并把解集在数轴上表示出来.
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(1)计算:
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4cos45°-(π-3.14)
(2)先化简,再选择一个你喜欢的整数a的值代入并求值
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.
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先找规律,再填数:
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+
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-1=
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,
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+
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-
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=
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,
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+
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-
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=
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,
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+
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-
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=
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,则
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+
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=
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.
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如图,平面直角坐标系中,M是双曲线y=
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上的一点,⊙M与y轴切于点C,与x轴交于A、B两点.若点C的坐标为(0,2),点A的坐标为(1,0),则k的值为
.
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