3.5x-0.8x

3.5x-0.8x 5.1X-3.5X=0.8的算式求X 6.8x-0.8+3.5=8.6x X+0.8X=? 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 解方程:x/4=30% 36/x=3/4 10/x=2.5/0.8 x/4=1.2/5 X/1.2=1.5/0.6 x/0.4=1.5/6 x/7=0.6/3.5 x/10=0.1/25-3x=8x+1 2(x-2)+2=x+1 3-x=2-5(x-1) 3x=5(32-x) 7(4-x)=9(x-4) 7x-8=2x+27 5x-18=3-2x (7x-4)+3(x-2)=2x+6 2(3x-4)+(4-x)=4x我是六年级的学生,我希望 3.5x+0.5x=12.8 x-0.5x=10.5 0.8x+4=7.2 这些怎么算? x x X x x x x x x x x