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a: Xét ΔEAD và ΔECG có
góc EAD=góc ECG
góc AED=góc CEG
=>ΔEAD đồng dạng với ΔECG
=>AD/CG=ED/EG
=>AD*EG=ED*CG
b: Xét ΔHEG và ΔHCB có
góc HEG=góc HCB
góc EHG=góc CHB
=>ΔHEG đồng dạng với ΔHCB
=>HE/HC=HG/HB
Xét ΔHAB và ΔHCG có
góc HAB=góc HCG
góc AHB=góc CHG
=>ΔHAB đồng dạng với ΔHCG
=>HA/HC=HB/HG
=>HC/HA=HG/HB
=>HC/HA=HE/HC
=>HC^2=HA*HE
c: HI//BA
=>HI/BA=CH/CA=CI/CB
HI//EG
=>HI/EG=BI/BC
HI/BA=CI/CB
HI/BA+HI/EG=BI/BC+CI/BC=1
=>HI(1/BA+1/EG)=1
=>1/BA+1/EG=1/HI
a: \(A=\dfrac{2x^2+x^2-1-2x^2+2x+1}{x\left(x+1\right)}=\dfrac{x^2+2x}{x\left(x+1\right)}=\dfrac{x+2}{x+1}\)
a: Xét ΔEAD và ΔECG có
góc EAD=góc ECG
góc AED=góc CEG
=>ΔEAD đồng dạng với ΔECG
=>AD/CG=ED/EG
=>AD*EG=ED*CG
b: Xét ΔHEG và ΔHCB có
góc HEG=góc HCB
góc EHG=góc CHB
=>ΔHEG đồng dạng với ΔHCB
=>HE/HC=HG/HB
Xét ΔHAB và ΔHCG có
góc HAB=góc HCG
góc AHB=góc CHG
=>ΔHAB đồng dạng với ΔHCG
=>HA/HC=HB/HG
=>HC/HA=HG/HB
=>HC/HA=HE/HC
=>HC^2=HA*HE
c: HI//BA
=>HI/BA=CH/CA=CI/CB
HI//EG
=>HI/EG=BI/BC
HI/BA=CI/CB
HI/BA+HI/EG=BI/BC+CI/BC=1
=>HI(1/BA+1/EG)=1
=>1/BA+1/EG=1/HI
\(a,=\dfrac{4xy-1-2xy+1}{5x^2y}=\dfrac{6xy}{5x^2y}=\dfrac{6}{5x}\\ b,=\dfrac{x^2+8x-2x+8}{x\left(x-4\right)\left(x+4\right)}=\dfrac{\left(x+2\right)\left(x+4\right)}{x\left(x-4\right)\left(x+4\right)}=\dfrac{x+2}{x\left(x-4\right)}\\ c,=\dfrac{x^2+3x-x+1}{x\left(x+1\right)\left(x-1\right)}=\dfrac{\left(x+1\right)^2}{x\left(x-1\right)\left(x+1\right)}=\dfrac{x+1}{x\left(x-1\right)}\\ d,=\dfrac{x-3-x-3-2x}{\left(x-3\right)\left(x+3\right)}=\dfrac{-2\left(x+3\right)}{\left(x-3\right)\left(x+3\right)}=\dfrac{2}{3-x}\\ e,=\dfrac{x+1-1}{x+1}=\dfrac{x}{x+1}\\ f,=\dfrac{3x+5-5+9x}{6x^2y}=\dfrac{12x}{6xy}=\dfrac{2}{y}\)
\(g,=\dfrac{x^2+6x-2x+4}{x\left(x+2\right)\left(x-2\right)}=\dfrac{\left(x+2\right)^2}{x\left(x+2\right)\left(x-2\right)}=\dfrac{x+2}{x\left(x-2\right)}\\ h,=\dfrac{3x+1-3x+1+2x-3}{\left(3x-1\right)\left(3x+1\right)}=\dfrac{2x-1}{\left(3x-1\right)\left(3x+1\right)}\\ j,=\dfrac{5x+30+x^2-30}{x\left(x+6\right)}=\dfrac{x^2+5x}{x^2+6x}\\ k,=\dfrac{\left(x-7\right)\left(x+7\right)}{2x+1}\cdot\dfrac{-3}{x-7}=\dfrac{-3\left(x+7\right)}{2x+1}\\ l,=\dfrac{x\left(3x-2\right)}{x^2-1}\cdot\dfrac{\left(x^2+1\right)\left(x^2-1\right)}{\left(3x-2\right)^3}=\dfrac{x\left(x^2+1\right)}{\left(3x-2\right)^2}\)
\(1,\\ a,=3x^2y-2xy^2-2xy^2=3x^2y-4xy^2\\ b,=\left(x+2\right)^2:\left(x+2\right)=x+2\\ c,=\dfrac{2}{x}\\ 2,\\ 1,\\ a,=2\left(x^2-2x+1\right)=2\left(x-1\right)^2\\ b,=\left(x-y\right)\left(x+y\right)+3\left(x-y\right)=\left(x-y\right)\left(x+y+3\right)\\ 2,\\ a,\Leftrightarrow x\left(x+5\right)=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-5\end{matrix}\right.\\ b,\Leftrightarrow3x\left(x-1\right)+\left(x-1\right)=0\\ \Leftrightarrow\left(x-1\right)\left(3x+1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-\dfrac{1}{3}\end{matrix}\right.\\ 3,\\ a,ĐK:x\ne\pm1\\ b,A=\dfrac{\left(x+1\right)^2}{\left(x-1\right)\left(x+1\right)}=\dfrac{x+1}{x-1}\\ c,A=2\Leftrightarrow\dfrac{x+1}{x-1}=2\Leftrightarrow x+1=2x-2\Leftrightarrow x=3\left(tm\right)\)
\(a)\)
\(\frac{1}{x+1}-\frac{x-1}{x}=\frac{3x+1}{x\left(x+1\right)}\)
\(\Leftrightarrow x-x^2+1=3x+1\)
\(\Leftrightarrow x^2-2x=0\)
\(\Leftrightarrow x\left(x-2\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x=2\end{cases}}\)
\(b)\)
\(\frac{\left(x+2\right)^2}{2x-3}-\frac{1}{1}=\frac{x^2+10}{2x-3}\)
\(\Leftrightarrow x^2+4x+4-2x-3=x^2+10\)
\(\Leftrightarrow x^2+2x+1=x^2+10\)
\(\Leftrightarrow2x-9=0\)
\(\Leftrightarrow2x=9\)
\(\Leftrightarrow x=\frac{2}{9}\)
a: Xét ΔADM và ΔCBN có
AD=CB
\(\widehat{DAM}=\widehat{BCN}\)
AM=CN
Do đó: ΔADM=ΔCBN
Suy ra: DM=BN
\(a.=x\)
\(b.=y^3\)
\(c.=3xy\)
\(d.=-\frac{5}{2}a\)
\(e.=3yz\)
\(f.=-3xy\)
làm cả bước giải ra đc ko ạ?