集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B={(x,y)|y≤-x+5,x∈N}先后掷两颗骰子,设第一颗骰子得点数记为a,掷第2颗骰子得数记做b,则(a,b)∈A∩B的概率等于?A1/4 B
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![集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B={(x,y)|y≤-x+5,x∈N}先后掷两颗骰子,设第一颗骰子得点数记为a,掷第2颗骰子得数记做b,则(a,b)∈A∩B的概率等于?A1/4 B](/uploads/image/z/3978472-40-2.jpg?t=%E9%9B%86%E5%90%88A%3D%7B%28x%2Cy%29%7C%7Bx-y-1%E2%89%A40%2Cx%EF%BC%8By-1%E2%89%A50%2Cx%E2%88%88N%7D%E9%9B%86%E5%90%88B%E9%9B%86%E5%90%88A%3D%7B%28x%2Cy%29%7C%7Bx-y-1%E2%89%A40%2Cx%EF%BC%8By-1%E2%89%A50%2Cx%E2%88%88N%7D%E9%9B%86%E5%90%88B%3D%7B%28x%2Cy%29%7Cy%E2%89%A4-x%2B5%2Cx%E2%88%88N%7D%E5%85%88%E5%90%8E%E6%8E%B7%E4%B8%A4%E9%A2%97%E9%AA%B0%E5%AD%90%2C%E8%AE%BE%E7%AC%AC%E4%B8%80%E9%A2%97%E9%AA%B0%E5%AD%90%E5%BE%97%E7%82%B9%E6%95%B0%E8%AE%B0%E4%B8%BAa%2C%E6%8E%B7%E7%AC%AC2%E9%A2%97%E9%AA%B0%E5%AD%90%E5%BE%97%E6%95%B0%E8%AE%B0%E5%81%9Ab%2C%E5%88%99%28a%2Cb%29%E2%88%88A%E2%88%A9B%E7%9A%84%E6%A6%82%E7%8E%87%E7%AD%89%E4%BA%8E%3FA1%2F4+B)
集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B={(x,y)|y≤-x+5,x∈N}先后掷两颗骰子,设第一颗骰子得点数记为a,掷第2颗骰子得数记做b,则(a,b)∈A∩B的概率等于?A1/4 B
集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B
集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B={(x,y)|y≤-x+5,x∈N}先后掷两颗骰子,设第一颗骰子得点数记为a,掷第2颗骰子得数记做b,则(a,b)∈A∩B的概率等于?
A1/4 B2/9 C7/36 D5/36
集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B集合A={(x,y)|{x-y-1≤0,x+y-1≥0,x∈N}集合B={(x,y)|y≤-x+5,x∈N}先后掷两颗骰子,设第一颗骰子得点数记为a,掷第2颗骰子得数记做b,则(a,b)∈A∩B的概率等于?A1/4 B
求黑色的面积与正方形的面积之比.答案是D.我只能帮你到这了.
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