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b) 3x - 2y + 3,5x - y + 2 + 0,5y =6,5x-2,5y+2
c) xy + 3x - y +1 - 2xy - 2x + y + 1 =x-xy+2
d) x²+ 2xy-3y ² -2x ² - y²- x ²+ 2xy =-2x^-4y^+4xy
b) 3x - 2y + 3,5x - y + 2 + 0,5y =6,5x-2,5y+2
c) xy + 3x - y +1 - 2xy - 2x + y + 1 =-xy+x+2+y
d) x²+ 2xy-3y ² -2x ² - y²- x ²+ 2xy =-2x²+4xy-4y²
:P
b) 3x - 2y + 3,5x - y + 2 + 0,5y =6,5x - 2,5y +2
c) xy + 3x - y +1 - 2xy - 2x + y + 1 = -xy + x +2----> -y z +y się skraca
+1 z -1 się skraca
d) x²+ 2xy-3y ² -2x ² - y²- x ²+ 2xy =
- 2x(kwadrat) + 4xy -4y(kwadrat)