I believe it is in my nature to dance by virtue of the beat of my heart, the pulse of my blood and the music in my mind. So I dance1.

    My dining room is now a2ballroom. Each morning when I3the house on the way to make coffee, I turn on the 4and it's dance time! I dance alone to whatever is playing.

    Tango(探戈)is a recent enthusiasm. It's a complex and5dance. The first time I went tango dancing I was too6to get out on the floor7 I stayed on edge of the dance floor when the dancing began. The fancy footwork8me. “Don't make a fool of yourself. Just9it. ” I thought10my mind, an older woman dropped out of the11sat down beside me, and said she had a secret for me. She12“If you do not join the dancing, we will know you are a fool. But if you dance, we will think well of you fo13 Inspired by her14words, I took up the15of tango.

    A friend asked me if I was a little too16“Tango? At your age? You must be out of your mind!" On the contrary, it's a deeply considered17I seek the sharp, scary18that comes from beginning something new, which19all my resources and challenges my body and mind. So, when people say, “Tango? At your age?” I20answer, “Yes!”

被减数、减数与差之和是570，减数是差的4倍，减数是____ ．

计算：

① $\frac{1}{2}$ ＋（＋3）＝____；②（－3）＋2＝____；③（ $-\frac{3}{2}$ ）＋（ -$\frac{1}{2}$ ）＝____；④（－5）＋ $\left|-9\right|$ ＝​____ .