Simplify a - {b-[c-(d-e) - 1 - g).
o a + b + c + d + e-f+g
a-b+ c-d + e-f+g
a + b + c-d + e-f+g
a-b+ c-d + e +f-g

Item 1 use the polygon tool to draw a rectangle with a length of 4 units and a height of 2 units. one of the sides of the rectangle falls on line ef , and the rectangle has a vertex of e. each segment on the grid represents 1 unit.