1.8-(0.4X-5)=0.7

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1.8-(0.4X-5)=0.7
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x

是这样的:x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

0.8x+0.4x=1.2   32x-9x-13x=60    0.

(1)0.8x+0.4x=1.2,             1.2x=

解方程:X=7(X-12) X-0.4X=0.

X=7(X-12)x=7x-846x=84x=84÷6x=14X-0.4X=0.540.6x=0.54x=0.54÷0.6x=0.9

4x-0.4=5x-(-24.6)

4x-0.4=5x-(-24.6)移项得到5x-4x=-(-24.6)-0.4得到x=25

5x-2x=54.6和1.8x+4.2x=5.4用方程解!

5x-2x=54.6;3x=54.6;x=18.2;1.8x+4.2x=5.46x=5.4;x=0.9

1.8-8x/1.2-1.3-3x/2-5x-0.4/0.3=0

(1.8-8x)/1.2-(1.3-3x)/2-(5x-0.4)/0.3=0(18-80x/12-(1.3-3x)/2-(50x-4)/3=01.5-20/3x-0.65+3/2x-5

解方程 x-0.4x=0.3 3x+x+1.8=5 2(x+1)=

再答:字好不好看就别介意了嘛再问:...

(1.8-8x)/1.2-(1.3-3x)/2-(5x-0.4)/0.3=0

(1.8-8x)/1.2-(1.3-3x)/2-(5x-0.4)/0.3=0(18-80x)/12-(1.3-3x)/2-(50x-4)/3=0(18-80x)-6(1.3-3x)-4(50x-4)=

已知x^2 - 5x + 1=0.求x^4 + 1/x^4的值

x^2+1=5x两边除以xx+1/x=5两边平方x^2+2+1/x^2=25x^2+1/x^2=23两边平方x^4+2+1/x^4=529x^4+1/x^4=527

若x+x^2+x^3+x^4=0.求x^5+x^6+…+x^2004的值

原式=x^4(x+x^2+x^3+x^4)+x^8(x+x^2+x^3+x^4)+.+x^2000(x+x^2+x^3+x^4)=0+0+0+.0=0

x一0.4x=0.

0.6×=0.54×=0.54÷0.6×=0.9

1、0.3X-0.4X=0.5 2、5X-2.5X+3.5X=-18 3、X-2/5X=-3+6

1、0.3X-0.4X=0.5-0.1X=0.5X=52、5X-2.5X+3.5X=-186X=-18X=-33、X-2/5X=-3+63/5X=3X=5

解方程X-1/3X=1.8 X-1/8X=9.45 X-2/5X=1.44

X-1/3X=1.8乘以3得3x-x=5.42x=5.4x=2.7X-1/8X=9.45乘以8得8x-x=75.67x=75.6x=10.8X-2/5X=1.443/5x=1.44x=2.4

1.8-8x/1.2-1.3-3x/2=5x-0.4/0.3如何计算结果X=11/5?

1.8-8x/1.2-1.3-3x/2=5x-0.4/0.31/2-20x/3-3x/2=5x-4/311/6=79x/6x=11/79

4×(0.8+X)=72 8X+2X=31.4 (X+1.8)÷4=2.5 3X+5X-4X=1.6 解方程

4×(0.8+x)=723.2+4x=724x=72-3.24x=68.8x=68.8÷4x=17.28x+2x=31.410x=31.4x=31.4÷10x=3.14(x+1.8)÷4=2.5(x+

用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.

#includesintjiesheng(intn)//用于计算阶乘如:3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x

2(0.9-x)+4=4.3.(x+1.8)/8=6.6.12x+12=16x.12x-35=5x.X/0.5-10+2

2(0.9-x)+4=4.31.8-2x+4=4.35.8-2x=4.32x=5.8-4.32x=1.5x=0.75(x+1.8)/8=6.6.x+1.8=52.8x=52.8-1.8x=5112x+

0.8:x=1.2:4 10:x=5:3/4 x/3=4.8/24 1.8:5.4=x:5.7 25:0.4=75:x

0.8:x=1.2:4(4/5)*4=(6/5)xx=8/310:x=5:3/410*(3/4)=5xx=3/2=1.5x/3=4.8/24x=4.8/8=0.61.8:5.4=x:5.71:3=x: