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b)m*n-m+n =-2*0,75+2+0,75=1,5+2+0,75=4,25 dla m= -2 n= 3/4
c)3x-4xy+x²-y² = -3*3-4*3*1+9-1=-9-12+9-1=-12 dla x=-3 y=-1
d)6xy-y+2y = 6*2*2-2-2*2=24-2-4=18 dla x=-2 y=-2
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8c² - 12 = 8 * ( - 1) ² - 12 = 9 - 12 = - 4
b)
m*n - m +n = ( - 2) * 3/4 - ( -2) + 3/4= - 6/4 + 2 3/4= - 1 2/4 + 2 3/4 = 1 1/4
c)
3x - 4xy + x² - y²=
3 *( -3) - 4 * ( - 3) * ( - 1) + (- 3)² - ( - 1)² =
- 9 - 12 + 9 - 1 = - 13
d)
6xy - y + 2y =
6 * ( -2) * ( - 2) - ( - 2)+ 2 * ( -2)=
24 + 2 - 4= 22