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(x+1)/(x+2)+(x+8)/(x+9)=(x+2)/(x+3)+(x+7)/(x+8)...

4(x-2)=x+1 4x-8=x+1 4x-x=1+8 3x=9 x=9÷3 x=3 很高兴为您解答,祝你学习进步!如果有其他问题请另发或点击向我求助,请谅解,谢谢! 有不明白的可以追问!如果您认可我的回答。请点击下面的【选为满意回答】按钮。

即1/(x+3)+2/(x-3)=1/(x+3)(x-3) 两边乘(x+3)(x-3) x-3+2x+6=1 3x=-2 x=-2/3 经检验,x=-2/3是方程的解

(1)圆M:(x+1)2+y2=1,圆N:(x-1)2+y2=9,设动圆P半径为R.∵M在N内,∴动圆只能在N内与N内切,不能是N在动圆内,即:R<3动圆P与圆M外切,则PM=1+R,动圆P与圆N内切,则PN=3-R,∴PM+PN=4,即P到M和P到N的距离之和为定值.∴P是以M、N为焦点...

(1) (x+2)^2+9+y^2=6y (x+2)^2 +(y-3)^2 =0 x=-2 and y=3 x^2 = 4 (2) m(m+2n)=4 (1) mn+n^2=-1 (2) (1) - 3(2) m^2-mn - 3n^2 =7

①5√8-2√32+√50 =5*3√2-2*4√2+5√2 =√2(15-8+5) =12√2 ②√6-√3/2-√2/3 =√6-√6/2-√6/3 =√6/6 ③(√45+√27)-(√4/3+√125) =(3√5+3√3)-(2√3/3+5√5) =-2√5+7√5/3 ④(√4a-√50b)-2(√b/2+√9a) =(2√a-5√2b)-2(√2b/2+3√a) =-4√a-6√2b ⑤√4x*(√3x/2-√x/6) =2√x(√6x...

[x-5+16/(x+3)]/[(x-1)/(x^2-9)] =(x-3)[ (x+3)(x-5)+16]/(x-1) =(x-3)(x^2-2x+1)/(x-1) =(x-3)(x-1) =x^2-4x+3

x²+x-2=70 x²+x-72=0 配方法 x²+x=72 x²+x+1/4=72+1/4=289/4 (x+1/2)²=(±17/2)² x+1/2=±17/2 x1=8,x2=-9 公式法 x²+x-72=0 a=1,b=1c=-72, b²-4ac=289=17² x=(-1±17)/2×1 x1=8,x2=-9 分解因式法 x&...

解:已知x+1/x=3,则(x+1/x)^2=9,即: x^2+x^-2=9-2=7 x-1/x=√(x-1/x)^2=√(x^2-2*x*1/x+x^-2)=√5 x^2-x^-2=(x+1/x)(x-1/x)=3*√5=3√5 log(4)9-log(5)4xlog(8)5 =log(2^2)3^2-log(5)2^2*log(2^3)5 =log(2)3-2/3*log(5)2*log(2)5 =log(2)3-2/3

①5√8-2√32+√50 =5*3√2-2*4√2+5√2 =√2(15-8+5) =12√2 ②√6-√3/2-√2/3 =√6-√6/2-√6/3 =√6/6 ③(√45+√27)-(√4/3+√125) =(3√5+3√3)-(2√3/3+5√5) =-2√5+7√5/3 ④(√4a-√50b)-2(√b/2+√9a) =(2√a-5√2b)-2(√2b/2+3√a) =-4√a-6√2b ⑤√4x*(√3x/2-√x/6) =2√x(√6x...

不完整? 这样行吗: x=(-3:0.1:3); y=x;[x,y]=meshgrid(x,y);z=y.*y/2-x.*x/2+x.^4/4;contour(x,y,z,50) 或者: x=(-3:0.1:3); y=x;[x,y]=meshgrid(x,y);z=y.*y/2-x.*x/2+x.^4/4;contour(x,y,z,500) view(22,62) 打字不易,如满意,望采纳。

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