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(1)3(x%2)=2%5(x%2) (2) 2(x+3)-5(1-x)=3(x...

解:去括号得 3-x=2-(5x-5) 3-x=2-5x+5 3-x=7-5x 移项得 3-7=-5x+x -4=-4x 系数化1得 x=1 ∴x=1是原方程的解

3(x-2)(x+1)-2(x-5)(x-3) =3(x²-x-2)-2(x²-8x+15) =3x²-3x-6-2x²+16x-30 =x²+13x-36

1-4x+10=9-3x x=11-9 x=2

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(X-1)=Y+5 3x-y=8 (1) 5(Y-1)=3(X+5) 3x-5y=-20 (2) (1)-(2),4y=28 y=7 代入(1) 3x=15 x=5 解为x=5,y=7

令 f(x)=y=x(x-1)(x-2)(x-3)(x-4)(x-5) 两边取对数得: lny = lnx + ln(x-1) + ln(x-2) + ln(x-3) + ln(x-4)+ ln(x-5) 两边求导得: 1/y * y′ = 1/x + 1/(x-1) + 1/(x-2) + 1/(x-3) + 1/(x-4) + 1/(x-5) f ′(x) = y′ = y { 1/x + 1/(x-1) + 1/(x...

由于 (1-x)(1+x+x^2)=1-x^3 1+x+x^2+x^3+x^4=(1-x^3)/(1-x)+x^3*(1+x) =(1-x^3)/(1-x)+[x^3*(1+x)*(1-x)]/(1-x) =(1-x^3)/(1-x)+[x^3*(1-x^2)]/(1-x) =(1-x^3)/(1-x)+(x^3-x^5))/(1-x) =(1-x^3+x^3-x^5)/(1-x) =(1-x^5)/(1-x)

没看懂你的,提供一个作参考…… //#include "stdafx.h"//vc++6.0加上这一行. #include "stdio.h" void main(void){ double x,y,tmp; int i,j; printf("Type x(0.5 1.0 2.0 3.0...,

您好 非常乐意为您解答 ⑴5-x,-1或-3 ⑶4.08×106 ⑸a2+1⑹错了吧? ⑽17

3/2[2/3(x/5-1)+2]-x=6 x/5-1+3-x=6 4x/5=4 x=5 (0.4x+0.1)/0.5-(0.01-0.2x)/0.04=5.75 2(0.4x+0.1)-25(0.01-0.2x)=5.75 0.8x+0.2-0.25+5x=5.75 5.8x=5.8 x=1 1/2x-2[1-1/4(x-3)]=x+1/2(x-3) 1/2x-2+1/2x-3/2=x+1/2x-3/2 -1/2x=2 x=-4

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