表达式23: polygon left parenthesis, left parenthesis, left parenthesis, "x" Subscript, 0 , Baseline plus "v" Subscript, 0 , Baseline "t" Subscript, 1 , Baseline plus 1 half "a" "t" squared , right parenthesis minus 0.5 , 0 , right parenthesis , left parenthesis, 0.5 plus left parenthesis, "x" Subscript, 0 , Baseline plus "v" Subscript, 0 , Baseline "t" Subscript, 1 , Baseline plus 1 half "a" "t" squared , right parenthesis , 0 , right parenthesis , left parenthesis, 0.5 plus left parenthesis, "x" Subscript, 0 , Baseline plus "v" Subscript, 0 , Baseline "t" Subscript, 1 , Baseline plus 1 half "a" "t" squared , right parenthesis , 0.5 , right parenthesis , left parenthesis, left parenthesis, "x" Subscript, 0 , Baseline plus "v" Subscript, 0 , Baseline "t" Subscript, 1 , Baseline plus 1 half "a" "t" squared , right parenthesis minus 0.5 , 0.5 , right parenthesis , right parenthesispolygonx0+v0t1+12at21−0.5,0,0.5+x0+v0t1+12at21,0,0.5+x0+v0t1+12at21,0.5,x0+v0t1+12at21−0.5,0.5
