Від смужки завдовжки 10 см відрізали 4см , а потім- ще 3 см. на скільки сантиметрів коротшою стала смужка? потрібно скласти умову

после первой операции "смужка" имела длину 10-4=6

после 2--ой операции 6-3=3

"смужка" стала "коротшою" на 10-3=7 см

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My room is small, but very cozy. i am very happy and comfortable here, as have all that i need. room square shape, very bright, because a large window facing south.before the window is a table with a lace table lamp beside her - stand for pens and pencils. the desk drawers i keep notebooks and other school stuff. at the table - the chair on which i sit, when i do homework.near the right wall next to the desk - a bookshelf with my favorite books and textbooks. next - wardrobe.on the other side of the window located my sports area - the swedish wall, beam, which can be tightened in order to train the hand and skin boxing "pear". here i am doing morning exercises.at the same wall is a my bed, or rather spread out sofa. when friends come to me, it can make, so it was convenient to sit. on the wall above the sofa hangs a small carpet. bed linen is stored in the chest that stands in the corner. on my dresser sitting soft fluffy friends: bear, rabbit and dog with one ear. on the wall above the chest of drawers - some of my drawings.on the floor lay a carpet of gray-green color. wallpaper on the walls of the room are light green, light-wood furniture. here such i the room interior. i like my room! : ) удачи! : ))