
145․ ա, բ

2*x-2*1+3*2-3*x=-x+4
2ab*3-2ab*2a+4b*3a-4b*7a2=18ab-32a2b
146. ա, ե

2x+x*x+x*1-1*x-1*1=2x+x2+x-x-1=x2+2x-1=2
4*2*4*x*x*2*x*x-x*1*x*x*2*1*2*x=246x7=7
147. բ դ ե

7x3y2-xy*-2x2y2+5xy3+12x5y4=-14x5y4+35x4y5+2x3y3+5x2y4+12x5y4=-2x5y4+35x4y5+2x3y3+5x2y4
a4-ab4-ab+ab*ab=a4-ab4-0
148. բ, գ, ե

x6-x4+x2-x4+x2+1-x4-x2-x2-1=x6-x8+x8+0
15x3y2-5xy+2*3x2y+x=15x3y2-3xy*3x3y
151.

-1*2*3=-6
-1*2*2*3*3*3=-108
3*-2*2*3=-36
2*-1*2*2*2*3*3=-144
-1*1-2*2-3*3*3=-27
7*-1*-1*-1-2*2-3*3*3=-38