(x+2/98 +1)+(x+4/96 +1) = (x+6/94 +1)+(x+8/92 +1) x+2+98/98+ x+4+96/96 -x+6+94/94 -x+8+92/92 = 0 x+100/98 +x+100/96- x+100/94- x+100/92= 0 (x +100 ).(1/98 +1/96 -1/94 -1/92 ) = 0 vi` 1/98 >1/94 1/96 >1/92 nen 1/98 +1/96 >1/94 +1/92 hay 1/98 +1/96 -1/94 -1/92 > 0 Do do`: x +100=0 hay x = -100 cac bn thong cam nhe may tinh mk ko viet dau dc