82. ա)2a+5b+7a=2a+7a+5b=9a+5b
բ)2x+3y+10x=2x+10x+3y=12x+3y
գ)7a+b+3a+b=10a+2b
դ)a+7b+b+2a=a+2a+7b+b=3a+8b
ե)2x+y+3x+y+4x=2x+3x+4x+y+y=9x+2y
զ)a+2x+5x+2a+9x=a+2a+2x+5x+9x=3a+16x
84. ա)1,1x-2,7y+0,8x-x+3y=1,1x+0,8-x-2,7y+3y=0,9x+0,3y
գ)1/3x+2/5y-x+1.1/4y=1/3x-x+2/5y+1.1/4y=-2/3x+33/20y=2/3x+1.13/20y
զ)1/4b-7x-3,2b+2.3/4x+b+0,6x=1/4b-3,2b+b-7x+2.3/4x+0,6x=-1.19/20b-3.13/20x
ը)ba²-3a³+7a²b+3a²-8a²b=ba²+7a²b-8a²b-3a³+3a²=-3a³+3a²
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