解：设这个角的度数为X。180-X=3(90-X)+10 180-X=270-3X+10180-X=280-3X 2X=280-180 2X=100 X=50
设这个角x度（180－x）=(90-x)*3+10x=50
设为x180-x=3(90-x)+10x=50
