Bài 3: Giải hệ phương trình bằng phương pháp thế
Các câu hỏi tương tự
Giải hệ phương trình
a)\(\left\{{}\begin{matrix}6x^2-3xy+x=1-y\\x^2+y^2=1\end{matrix}\right.\) c)\(\left\{{}\begin{matrix}\left|x+1\right|+\left|y-1\right|=5\\\left|x+1\right|-4y+4=0\end{matrix}\right.\)
b)\(\left\{{}\begin{matrix}2x^2-2x+xy-y=0\\x^2-3xy+4=0\end{matrix}\right.\)
1)left{{}begin{matrix}x^2-y^2-2x+2y0x^2-3xy+5y^2-30end{matrix}right.
2)left{{}begin{matrix}frac{1}{x}+frac{1}{1-y}1frac{1}{x-1}-frac{1}{y}2end{matrix}right.
3)left{{}begin{matrix}x^2-4x+30x^2+xy+y^21end{matrix}right.
4)left{{}begin{matrix}x^2+y^2+x+y2left(x+1right)^2-left(y+2right)^20end{matrix}right.
Đọc tiếp
1)\(\left\{{}\begin{matrix}x^2-y^2-2x+2y=0\\x^2-3xy+5y^2-3=0\end{matrix}\right.\)
2)\(\left\{{}\begin{matrix}\frac{1}{x}+\frac{1}{1-y}=1\\\frac{1}{x-1}-\frac{1}{y}=2\end{matrix}\right.\)
3)\(\left\{{}\begin{matrix}x^2-4x+3=0\\x^2+xy+y^2=1\end{matrix}\right.\)
4)\(\left\{{}\begin{matrix}x^2+y^2+x+y=2\\\left(x+1\right)^2-\left(y+2\right)^2=0\end{matrix}\right.\)
Bµi 1: A)left{{}begin{matrix}X35.left(Y+2right)X50.left(Y-1right)end{matrix}right.
b)left{{}begin{matrix}Y2X-3YX-1end{matrix}right.
C) left{{}begin{matrix}left(X+14right).left(Y-2right)X.Yleft(X-4right).left(Y+1right)X.Yend{matrix}right.
D)left{{}begin{matrix}Yfrac{6-X}{4}Yfrac{4X-5}{3}end{matrix}right.GIẢI BÀI 1 BẰNG PHƯƠNG PHAP THẾ
Đọc tiếp
Bµi 1: A)\(\left\{{}\begin{matrix}X=35.\left(Y+2\right)\\X=50.\left(Y-1\right)\end{matrix}\right.\)
b)\(\left\{{}\begin{matrix}Y=2X-3\\Y=X-1\end{matrix}\right.\)
C) \(\left\{{}\begin{matrix}\left(X+14\right).\left(Y-2\right)=X.Y\\\left(X-4\right).\left(Y+1\right)=X.Y\end{matrix}\right.\)
D)\(\left\{{}\begin{matrix}Y=\frac{6-X}{4}\\Y=\frac{4X-5}{3}\end{matrix}\right.\)GIẢI BÀI 1 BẰNG PHƯƠNG PHAP THẾ
Giải hệ phương trình
left{{}begin{matrix}4left(2x-y+3right)-3left(x-2y+3right)483left(3x-4y+3right)+4left(4x-2y-9right)48end{matrix}right.
left{{}begin{matrix}6left(x+yright)8+2x-3y5left(y-xright)5+3x+2yend{matrix}right.
left{{}begin{matrix}-2left(2x+1right)+1,53left(y-2right)-6x11,5-4left(3-xright)2y-left(5-xright)end{matrix}right.
left{{}begin{matrix}dfrac{8x-5y-3}{7}+dfrac{11y-4x-7}{5}12dfrac{9x+4y-13}{5}-dfrac{3left(x-2right)}{4}15end{matrix}right.
left{{}begin{matrix}2sqrt{3}x-sqrt{5}y2...
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Giải hệ phương trình
\(\left\{{}\begin{matrix}4\left(2x-y+3\right)-3\left(x-2y+3\right)=48\\3\left(3x-4y+3\right)+4\left(4x-2y-9\right)=48\end{matrix}\right.\)
\(\left\{{}\begin{matrix}6\left(x+y\right)=8+2x-3y\\5\left(y-x\right)=5+3x+2y\end{matrix}\right.\)
\(\left\{{}\begin{matrix}-2\left(2x+1\right)+1,5=3\left(y-2\right)-6x\\11,5-4\left(3-x\right)=2y-\left(5-x\right)\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\dfrac{8x-5y-3}{7}+\dfrac{11y-4x-7}{5}=12\\\dfrac{9x+4y-13}{5}-\dfrac{3\left(x-2\right)}{4}=15\end{matrix}\right.\)
\(\left\{{}\begin{matrix}2\sqrt{3}x-\sqrt{5}y=2\sqrt{6}-\sqrt{15}\\3x-y=3\sqrt{2}-\sqrt{3}\end{matrix}\right.\)
a) left{{}begin{matrix}2x+404x+2y-3end{matrix}right. c)left{{}begin{matrix}left(x-15right).left(y+2right)x.yleft(x+15right).left(y-1right)x.yend{matrix}right.
b)left{{}begin{matrix}2x+4yx+2y-3end{matrix}right. d) left{{}begin{matrix}frac{1}{x}+frac{1}{y}5frac{2}{x}+frac{5}{y}7end{matrix}right. tính bằng phương pháp cộng dại số
Đọc tiếp
a) \(\left\{{}\begin{matrix}2x+4=0\\4x+2y=-3\end{matrix}\right.\) c)\(\left\{{}\begin{matrix}\left(x-15\right).\left(y+2\right)=x.y\\\left(x+15\right).\left(y-1\right)=x.y\end{matrix}\right.\)
b)\(\left\{{}\begin{matrix}2x+4=y\\x+2y=-3\end{matrix}\right.\) d) \(\left\{{}\begin{matrix}\frac{1}{x}+\frac{1}{y}=5\\\frac{2}{x}+\frac{5}{y}=7\end{matrix}\right.\) tính bằng phương pháp cộng dại số
Giải hệ phương trình sau bằng phương pháp thế
1) \(\left\{{}\begin{matrix}x-2y=4\\-2x+5y=-3\end{matrix}\right.\)
2) \(\left\{{}\begin{matrix}2x+y=10\\5x-3y=3\end{matrix}\right.\)
3) \(\left\{{}\begin{matrix}x+2y=4\\-3x+y=7\end{matrix}\right.\)
1.Giải hệ phương trình:
a.left{{}begin{matrix}2sqrt{2}x+y2sqrt{2}7x-3y7end{matrix}right.
b.left{{}begin{matrix}7x+y-frac{1}{7}-frac{4}{3}x-2y1frac{1}{3}end{matrix}right.
c.left{{}begin{matrix}2sqrt{5}x+3ysqrt{2}sqrt{5}x-y3sqrt{2}end{matrix}right.
d.left{{}begin{matrix}frac{2}{x}+frac{3}{y}-5frac{3}{x}-frac{4}{y}1end{matrix}right.
e.left{{}begin{matrix}-frac{5}{3x+1}+frac{7}{2x+1}frac{5}{7}frac{1}{3x+1}-frac{1}{2y-3}frac{2}{7}end{matrix}right.
g.left{{}begin{matrix}2x^2+5y^2129-3x^2+y^213en...
Đọc tiếp
1.Giải hệ phương trình:
a.\(\left\{{}\begin{matrix}2\sqrt{2}x+y=2\sqrt{2}\\7x-3y=7\end{matrix}\right.\)
b.\(\left\{{}\begin{matrix}7x+y=-\frac{1}{7}\\-\frac{4}{3}x-2y=1\frac{1}{3}\end{matrix}\right.\)
c.\(\left\{{}\begin{matrix}2\sqrt{5}x+3y=\sqrt{2}\\\sqrt{5}x-y=3\sqrt{2}\end{matrix}\right.\)
d.\(\left\{{}\begin{matrix}\frac{2}{x}+\frac{3}{y}=-5\\\frac{3}{x}-\frac{4}{y}=1\end{matrix}\right.\)
e.\(\left\{{}\begin{matrix}-\frac{5}{3x+1}+\frac{7}{2x+1}=\frac{5}{7}\\\frac{1}{3x+1}-\frac{1}{2y-3}=\frac{2}{7}\\\end{matrix}\right.\)
g.\(\left\{{}\begin{matrix}2x^2+5y^2=129\\-3x^2+y^2=13\end{matrix}\right.\)
giải hệ pt bằng phương pháp thế:
a,\(\left\{{}\begin{matrix}3x+y=-2\\-9x-39=6\end{matrix}\right.\)
b,\(\left\{{}\begin{matrix}x+y=101\\-x+y=-1\end{matrix}\right.\)
c,\(\left\{{}\begin{matrix}x+y=2\\\dfrac{1}{2}x+y=\dfrac{5}{4}\end{matrix}\right.\)
d,\(\left\{{}\begin{matrix}x-5y=16\\10y-2x=-32\end{matrix}\right.\)
Giải hpt
a)\(\left\{{}\begin{matrix}x+y+z=1\\x+2y+4z=8\\x+3y+9z=27\end{matrix}\right.\) b)\(\left\{{}\begin{matrix}x^2+y^2+x+y=62\\xy=24\end{matrix}\right.\) c)\(\left\{{}\begin{matrix}\dfrac{3}{2x+y}+z=2\\2y-3z=4\\\dfrac{2}{2x+y}-y=\dfrac{3}{2}\end{matrix}\right.\)