№40
(7-2)*(8-2)/2-(7-2)(5-2)/2=5*6/2-5*3/2=15-7,5=7,5
№41
(5-2)(4-1)+(2-1)*(4-1)=3*3+1*3=9+3=12
№42
(6-3)(6-1)+(6-1)*(3-2)/2+(6-1)*(8-6)/2=3*5+5*1/2+5*2/2=15+2,5+5=22,5
№43
(7-4)(4-1)+(8-7)(4-1)/2+(4-1)(4-1)/2=3*3+1*3/2+3*3/2=9+1,5+4,5=15
№44
(4-3)(7-2)+(5-4)(7-2)/2+(3-1)(7-2)/2=1*5+1*5/2+2*5/2=5+2,5+ 5=12,5
№45
(6-1)(3-1)+(8-6)(3-1)/2=5*2+2*2/2=10+2=12
№46
(5-4)(5-2)+(4-1)(5-2)/2=1*3+3*3/2=3+4,5=7,5
№47
(5-1)(5-1)+(5-1)(6-5)/2=4*4+4*1/2=16+2=18
№48 не видно цифры по оси Х