1.2-0.9 5x=0.8的验算
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解由1.2x-x=6得(1.2-1)x=6即0.2x=6两边除以0.2解得x=30再问:完整的解
x+1.2x=0.222.2x=0.22x=0.22/2.2=2.2/22=0.1
6x=24x=41.58*4=6.3210x=8x=0.870*0.8-29.5=26.5再问:确定答案吗?直接采纳喽
(1)0.8x+0.4x=1.2, 1.2x=
4x-1.5/0.5—5x-0.8=1.2-x/0.18x-3-5x-0.8=12-10x3x-3.8=12-10x3x+10x=12+3.813x=15.8x=79/65如还有新的问题,请不要追问的
再答:再问:第一道题是什么,能打字打出来吗?再答:
x-0.8x=100.2x=10x=50
0.8X-0.6X=100.2X=10X=50验算:0.8*50-0.5*1.2*50=40-30=10左右相等则X=50是次方程的解.
(140%x*0.8-50)-x=701.12x-50-x=701.12x-x=50+700.12x=120x=120÷0.12x=1000
6x=1.2x=1.2/6x=0.2
3-0.2=1.2X-0.8X2.8=0.4XX=7
0.8x-1.2(18-x)=17.60.8x+1.2x=17.6-1.2*182x=17.6-21.62x=-4x=-2再问:17.6怎么减-21.6?再答:应该是:17.6+21.6=0.8x+1
2x-(0.8x+40)+(1.2x-20)=9002x-0.8x-40+1.2x-20=9002x-0.8x+1.2x=900+40+202.4x=960x=400
2x=12.6x=6.3
设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=
f(x)=x^xlnf(x)=lnx^x=xlnx(lnf(x))=f'(x)/f(x)=lnx+x*1/x=lnx+1∴f'(x)=f(x)(lnx+1)=x^x(lnx+1)
(x+x)+(x-x)+(xx)+(x/x)=1002x+0+x²+1=100x²+2x+1=100(x+1)²=10²x+1=10或x+1=-10x=9或x=
0.5x+12-0.8x=10.5;0.3x=1.5;x=5;
如满意请采纳~谢谢再答:
(1)若函数为:f(x)=x^[x(x-a)]f'(x)=[x(x-a)]*[x^(x^2-ax-1)]*[x(x-a)]'=(x^2-ax)*(2x-a)*[x^(x^2-ax-1)]=[2(x^3