6.8x-0.8+3.5=8.6x

求x 的值.x +3.5x =9.9;4.25x -x =4.55;10x -2.7x =58.4;6.8x +3.2x (x-16.7%)/x=-8.6% X=? （X+X)+(X-X)+(X*X)+(X/X)=100 x-0.8x=16 x=? x-4x=102 x-0.8x=22 解方程.5.5x十6.7=7.8,3.5x-0.8x=11.34,6.2x-x=41.6,4(10-x)=32,9(x+ f（x）=5x^5+2x^4+3.5x^3-2.6x^2+1.7x-0.8,用秦九韶法计算多项式当x=5时 x+12.5=3.5x x-0.8x=46 X-0.8X=2 3.5x+0.5x=12.8 x-0.5x=10.5 0.8x+4=7.2 这些怎么算? (1)3.5x+x-14=18.4 (2)2.7*2-1.5x=0 (3)13x-6.8x+x=46.8 (4)17.5