2、A(有一个角占180度的(1+5+6)分之6即一半为90度)
3、B、(红色笔的支数比黄色笔少三分之一,反过来说是:黄色笔比红色笔的支数多二分之一;而蓝色笔的支数比红色笔多三分之一,显然黄色笔多)
4、当M>7分之6或M<负7分之6时,选B;当负7分之6
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