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2:(x%1)=4/5能简要简

2:(x-1)=4/5 2:(x-1)=4:5 4(x-1)=10 x-1=2.5 x=3.5

这道题要求计算能力很强 3/x+1/(x-1)+4/(x-2)+4/(x-3)+1/(x-4)+3/(x-5)=0 [3/x+3/(x-5)]+[1/(x-1)+1/(x-4)]+[4/(x-2)+4/(x-3)]=0 (6x-15)/(x^2-5x)+(2x-5)/(x^2-5x+4)+(8x-20)/(x^2-5x+6)=0 (2x-5)[3/(x^2-5x)+1/(x^2-5x+4)+4/(x^2-5x+6)]=0 所...

3.5*5/4+5/4+3/2÷4/5 =5/4(3.5+1+3/2) =5/4*6 =15/2 2分之15=7.5

2:(1-X)=4/5 4(1-X)=2*5 4(1-X)=10 1-X=2.5 -X=2.5-1 -X=1.5 X=-1.5

答案是十分之一。

设 (1+1/2+1/3+1/4)=a (1/2+1/3+1/4)=b 则a-b=1 把a,b代入上面式子得 a(b+1/5)-(a+1/5)b =ab+1/5a-ab-1/5b =1/5(a-b) =1/5 (上面的1/6打错,应该是1/5)

(0.1x-3)/0.04=x-0.4(3-0.5x)/0.5 2.5x-75=x-0.8(3-0.5x) 2.5x-75=x-2.4+0.4x 1.1x=72.6 x=66 x-0.3=3.12*3+x/4 x-0.3=9.36+0.25 0.75x=9.66 x=12.88 3分之1(x-5)=3-3分之2(x-5) x-5=3 x=8 2x-2分之x+1=3分之4-3分之x+2 12x+3(x+1)=8-2(x+2)...

这个简单: 首先前两项不会产生x^3的系数 第三项x^3是1 第四项呢是0 第五项是(x-5)^5? 如果是(x-1)是-4 所以是总的x^3系数是-3

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