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1.,2.,,.8n+5n8+5n8n+5n=8+5n=13n8n+5nn-7a2b+2a2b=-7+2a2b=-5a2b8n5n2a2b-7a2bx+yxy2ab5abba3-48n+5n=13n-7a2b+2a2b=-5a2b6xy-10x2-5yx+7x2+5x=6xy-5yx+-10x2+7x2+5x=6-5xy+-10+7x2+5x=xy-3x2+5x1._________-xya2bab2-3pq3pqabcaca2a3-3x4a42.2x3yn-xmy2m+n=___.3.5x2y7ymxnm=____,n=______4.A7a-3a=4aB7a+2a=9a2C7a-7a=aD-4a-4a=011-xy2+3xy227a+3a2+2a-a2+31-xy2+3xy2=-1+3xy2=2xy227a+3a2+2a-a2+3=7a+2a+3a2-a2+3=7+2a+3-1a2+3=9a+2a2+3213a+2b-5a-b2-4ab+b2-9ab-b213a+2b-5a-b=3a-5a+2b-b=3-5a+2-1b=-2a+b2-4ab+b2-9ab-b2=-4ab-9ab+b2-b2=-13ab-b2-3x2y+5x-0.5x2y+3.5x2y-2x=y=7.-3x2y+5x-0.5x2y+3.5x2y-2=-3x2y-0.5x2y+3.5x2y+5x-2=5x-2x==5=13a+abc-c2-3a+c2a=-b=2,c=-3.3a+abc-c2-3a+c2=3a-3a+abc+c2-c2=abca=-b=2,c=-3.=-2-3=143x4+3x-144x-x-1313x3x+14+3x-1=4+3x-3=3x+14x-x-1=4x+-1x-1=4x+-1x+-1-1=4x-x+1=3x+1+,+,;,,.314a-a-3b2a+5a-3b-a-2b332xy-y-2xy45x-y-2x-y14a-a-3b=4a-a+3b=3a+3b2a+5a-3b-a-2b=a+5a-3b-a+2b=5a-b332xy-y-2xy=6xy-3y-2xy=4xy-3y45x-y-2x-y=5x-y-2x-2y=5x-y-2x+2y=3x+y1.22x-5-31-4x=__________22x-5-31-4x=4x-10-3+12x=6x-132.4x-4-4x-5=__________4x-4-4x-5=4x-4-4x+5=11231.2.ab10a+b10b+a.10a+b+10b+a=________________1.388338+83=12111,,+=.2.10b+a+(10a+b)=11a+11b=11(a+b)ABC,CBACBA-ABC=100C+10B+A-100A-10B-C=99C-99A=99(C-A)99,.100a+10b+c12x2-3x+1-3x2+5x-72-x2+3xy-y2-x2+4xy-y212x2-3x+1+-3x2+5x-7=2x2-3x+1-3x2+5x-7=2x2-3x2-3x+5x+1-7=-x2+2x-62-x2+3xy-y2--x2+4xy-y2=-x2+3xy-y2+x2-4xy+y2=-x2+x2+3xy-4xy-y2+y2=x2-xy+y21.abc|b+c|-|b+a|+|a+c||b+c|-|b+a|+|a+c|=-b+c--b-a+a+c=-b-c+b+a+a+c=2a2.x-3x2+mx+nx2-x+3xm+nm-n-3x2+mx+nx2-x+3=n-3x2+m-1x+3m=1n=3m+nm-n=1+31-3=-83.m5m______m+m+5mm.m+5.1.x+32+|x-y+10|=05x2y-[2x2y-3xy-xy2-3x2]-2xy2-y2x+32+|x-y+10|=0x+3=0x-y+10=0x=-3y=75x2y-[2x2y-3xy-xy2-3x2]-2xy2-y2=5x2y-2x2y+3xy-xy2+3x2-2xy2-y2=3x2y+3xy-xy2+3x2-2xy2-y2=3x2y-3xy2+3xy+3x2-y2x=-3y=7=3-327-3-372+3-37+3-32-72=397+949-97+39-49=189+441-63+27-49=5452.A3x2-5x+22x2-4x+3AA=2x2-4x+3-3x2-5x+2=2x2-4x+3-3x2+5x-2=-x2+x+11.2.3.941,961