(45% x + 15) / x = 60% x怎么解

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(45%x+15)/x=60%x怎么解(45%x+15)/x=60%x怎么解(45%x+15)/x=60%x怎么解45%x+15=60%xx60%xx-45%x-15=060xx-45x-1500=0

(45% x + 15) / x = 60% x怎么解
(45% x + 15) / x = 60% x怎么解

(45% x + 15) / x = 60% x怎么解
45%x+15=60%xx
60%xx-45%x-15=0
60xx-45x-1500=0
4xx-3x-100=0
xx-3/4x-25=0
xx-3/4x+9/64-25-9/64=0
(x-3/8)*(x-3/8)=25+9/64
x-3/8=(25+9/64)开根号
x=(25+9/64)开根号+8/3

(x-2)(x²-6x-9)-x(x²-2x-15),其中x=1/3 先化简再求值 (x-2)(x-6x-9)-x(x-2x-15),其中先化简再求值 (x-2)(x-6x-9)-x(x-2x-15),其中x=6分之一 (45% x + 15) / x = 60% x怎么解 X(x平方-6x-9)-x(x平方-8x-15)+2x(3-x)其中x=-六分之一 15x(3x-8)-4X(2X+3)=6X(4X-4)-4 6x-x=15(过程) x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x) 4.2-0.6x=3.6x 5x+2x=33.6 7x-4x=0.75 2x+7x+2.1=12 56x-32x-119=361 x+5=2x 3x+9=6x 4x-28=2x 2x+18=7x 5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2)除2=71 5x+15x =( + )x =20x 56+6x=98.80-5x=42 (45+15)x=70 请问,这十道关于一元一次方程的题目我做对了吗?(1)2X+3X+4X=189X=18X=2(2)13X-15X+X=-3-1X=-3X=3(3)2.5X+10X-6X=15-21.56.5X=6.5X=1(4)4X+3(2X-3))=12-(X+4)4X+6X-9=12X-4810X-12X=-48+9-2X=-57X=28.5(5) 7X+2(3X-3)=207X+6X-6=2013X=20+6 因式分解法解下列方程 1、用因式分解法解下列方程:(1)3y^2-5y=0 (2)4x^2=12x (3)x^2+9=-6x (4)9x^2=(x-x^3-3x^2-13x+15 =x^3-3x^2+2x-15x+15 =x(x^2-3x+2)-15(x-1) =x(x-2)(x-1)-15(x-1) =(x-1)[x(x-2)-15] =(x-1)[x^2-2x-15] =(x-1)(x-5)(x+ 解方程(x-2)X(x的平方-6x-9)=x(x-5)X(x-3) 用matlab求解一个优化问题(目标函数非线性,约束函数线性)min f(x)=12*x(1)+21*x(2)+21*x(3)+13*x(4)+20*x(5)+23*x(6)+15*x(7)+17*x(8)+27*x(9)+17*x(10)+19*x(11)+31*x(12)+200*[(x(1)+x(2)+x(3))^0.6+(x(4)+x(5)+x(6))^0.6+(x(7)+x(8)+x(9)) matlab解数值分析题p=(x-1)*(x-2)*(x-3)*(x-4)*(x-5)*(x-6)*(x-7)*(x-8)*(x-9)*(x-10)*(x-11)*(x-12)*(x-13)*(x-14)*(x-15)*(x-16)*(x-17)*(x-18)*(x-19)*(x-20)解为1,2,3……,20取多个非常小的数用软件工具求解方程p(x)+n*x^19=0,并 计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=? 15X(4X-8)-5X(2X+10)=6X(5X-20) x(-6x-9)-x(-8x-15)+2x(3-x)=?