ๆ $2x^{2}\left(a^{2}+b^{3}\right)-4x\left(a^{2}+b^{2}\right)$ $26\right)$ $ax+by+bx+ay$ $12\right)$ $5xy+5x2+y+2$ $14\right)$ $x^{2}-3x+3y-xy$

$4$ $12\right)$ $5xy+5xz+y+2$ 11) $3x^{2}-2xy-3xy+2y$ - $14\right)$ $x^{2}-3x+3y-xy$ 13) $ab^{2}-cb^{2}-6a+6c$ - น - 15) $x^{3}-x^{2}z+y^{2}z-y^{2}$ $16\right)$ ab $+a^{2}c+6c+6b$ 17) $bx-ab+x^{2}-ax$ $18\right)$ $2ax^{2}+3axy-2bxy-3by^{2}$ 19) $axy+bcxy-az-bcz$ $20\right)$ $a^{2}c^{2}$ $+acd$ $+abc+bd$ | ||

$11$ $3x^{2}-2xy-3xy+2y^{2}$ $12\right)$ $5xy+5xz+y+z$ $=$ $=$ $=$ $=$ $=$ $=$ $13\right)$ ab $=$ $cb^{2}-6a+6c$ $14\right)$ $x^{2}-3x+3y-xy$ $=$ $=$ $=$