1.8-(0.4X-5)=0.7
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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(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊
(1)0.8x+0.4x=1.2, 1.2x=
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)移项得到5x-4x=-(-24.6)-0.4得到x=25
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(18-80x/12-(1.3-3x)/2-(50x-4)/3=01.5-20/3x-0.65+3/2x-5
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(18-80x)/12-(1.3-3x)/2-(50x-4)/3=0(18-80x)-6(1.3-3x)-4(50x-4)=
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
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
0.6×=0.54×=0.54÷0.6×=0.9
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
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-0.4/0.31/2-20x/3-3x/2=5x-4/311/6=79x/6x=11/79
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+
#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=4.31.8-2x+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(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: