x-0.8x=1.5
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3x-18=13.23x=13.2+18x=10.41.5x-x=60.5x=6x=6/0.5=124x+1.2x=265.2x=26x=5
36-(3x-10)=x-2x36-3X+10=-X3X+(-X)=462X=46X=233.2x=14.2-1.5x3.2X+1.5X=14.24.7X=14.2X=142/47再问:(-X)是什么
1.5X*0.8-X=101.2x-x=100.2x=10x=50再问:谢谢,请问12.5-X=X8*12%呢?再答:2.5-X=X8*12%2.5=0.96x+x1.96x=2.5x=125/98
(4x-1.5)/0.5-(5x-0.8)/0.2=(1.2-x)/0.1+320(4x-1.5)-50(5x-0.8)=100(1.2-x)+3080x-30-250x+40=120-100x+30
x/4=30%x=4*30%=120%36/x=3/43x=36*4x=36*4/3=4810/x=2.5/0.82.5x=10*0.8x=10*0.8/2.5=3.2x/4=1.2/55x=4*1.
(X+X)+(X-X)+(X*X)+(X/X)=1002X+0+X*X+1=1002X+X*X=99X(X+2)=99X=9再问:请问X(X+2)=99解为什么就等于9了呢没看懂再答:换成算术法你就明
0或41分之3200,用公式法解再问:是41分之80根号41....
20+0.8x=x-14x-0.8x=20+140.2x=34x=170112-4x=2x(80-4x)112-4x=160-8x8x-4x=160-1124x=48x=12
2(0.7x+6)-5(0.8x+3)=8(1.5x-8)-5(3.2x-3.8)1.4x+12-4x-15=12x-64-16x+191.4x-4x-3=-4x-451.4x-4x+4x=3-451
x-0.8x=46(1-0.8)x=460.2x=46x=46÷0.2x=230如果帮到你,请记得采纳,O(∩_∩)O谢谢
0.8×1.5x+900=1.5x+900×0.1.2x+900=1.5x+5401.5x-1.2x=900-5400.3x=360x=1200
1.5x+0.8*1.1x=10.781.5x+0.88x=10.782.38x=10.78x=10.78/2.38x=4.53
X-0.8X=20.2X=2X=2/0.2X=10
28X=84X=30.8X=60X=751.6X=8X=53X=24X=80.5X=1X=2再问:要过程啊我这是作业汗快点把我很急谢谢你啊再答:30X-2X=8428X=8428X÷28=84÷28X
x-4x=102-3x=102x=-34x-0.8x=220.2x=22x=110
0.2x=16x=80
5(2-x)=-(2x-7)0.5x-2=0.8(2x-1.5)2(x+0.5)-3(x-0.4)=5.610-5x=-2x+70.5x-2=1.6x-1.22x+1-3x+1.2=5.6-5x+2x
#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
由σ^2=Ex^2-(Ex)^2得Ex^2=σ^2+(Ex)^2=2.89故E(7-4X+2X^2)=7-4*Ex+2*Ex^2=7-6+2*2.89=6.78约等于6.8
2x等于x+15x等于15