Đại số lớp 8
Các câu hỏi tương tự
1) tínha) frac{4}{x+2}+frac{3}{2-x}+frac{12}{x^2-4}b) x+frac{x-1}{2}+frac{x-2}{3}c) frac{1}{3x-2}-frac{4}{3x+2}-frac{3x-6}{4-9x^2}d) x - 2 - frac{x^2-10}{x+2}e) frac{1}{2x-2y}-frac{1}{2x+2y}+frac{y}{y^2-x^2}f) frac{1}{a+1}-frac{3}{a^3+1}+frac{3}{a^2-a+1}g) frac{4-2x+x^2}{x+2}-2-xh)frac{1}{x^3-x}-frac{1}{x^2-x}+frac{2}{x^2-1}j) frac{1}{2x+3}-frac{1}{2x-3}+frac{x-2}{2x^2-x-3}
Đọc tiếp
1) tính
a) \(\frac{4}{x+2}+\frac{3}{2-x}+\frac{12}{x^2-4}\)
b) \(x+\frac{x-1}{2}+\frac{x-2}{3}\)
c) \(\frac{1}{3x-2}-\frac{4}{3x+2}-\frac{3x-6}{4-9x^2}\)
d) x - 2 - \(\frac{x^2-10}{x+2}\)
e) \(\frac{1}{2x-2y}-\frac{1}{2x+2y}+\frac{y}{y^2-x^2}\)
f) \(\frac{1}{a+1}-\frac{3}{a^3+1}+\frac{3}{a^2-a+1}\)
g) \(\frac{4-2x+x^2}{x+2}-2-x\)
h)\(\frac{1}{x^3-x}-\frac{1}{x^2-x}+\frac{2}{x^2-1}\)
j) \(\frac{1}{2x+3}-\frac{1}{2x-3}+\frac{x-2}{2x^2-x-3}\)
Chứng minh đẳng thức:
a.\(\frac{a^3-4a^2-a+4}{a^3-7a^2+14a-8}=\frac{a+1}{a+2}\)
b.\(\frac{x^4+x^3+x+1}{x^4-x^3+2x^2-x+1}=\frac{\left(x+1\right)^2}{x^2+1}\)
giải jùm vs
Rút gọn Pthức:
A= \(\left(\frac{1}{x+1}-\frac{3}{x^3+1}+\frac{3}{x^2+x+1}\right)\frac{3x^2-3x+3}{\left(x+1\right)\left(x+2\right)}-\frac{2x-2}{x^2+2x}\)
c/m các biểu thức sau không phụ thuộc vào biến x,y
a) \(\frac{\left(x+a\right)^2-x^2}{2x+a}\)
b) \(\frac{x^2-y^2}{axy-ax^2-ay^2-axy}\)
c) \(\frac{2ax-2x-3y+3ay}{4ax+6y+9y+6ay}\)
GIẢI PHƯƠNG TRÌNH SAU
A) \(\frac{X^2+2X+1}{X^2+2X+2}+\frac{X^2+2X+2}{X^2+2X+3}=\frac{7}{6}\)
B) \(\frac{\left(X^2-3X-4\right)^4}{\left(X-3\right)^5\left(X+2\right)^3}+\frac{\left(X^2+4X+3\right)^6}{\left(X-3\right)^3\left(X+2\right)^5}=0\)
Rút gọn
A= \(\frac{2ax^2-4ax+2a}{5b-bx^2}\)
B=\(\frac{5\left(x-y\right)-3\left(y-x\right)}{10\left(x-y\right)}\)
Rút gọn biểu thức:
a, \(\frac{x^4+15x+7}{2x^3+2}.\frac{x}{14x^2+1}.\frac{4x^3+4}{x^4+15x+7}\)
b, \(\frac{x^7+3x^2+2}{x^3-1}.\frac{3x}{x+1}.\frac{x^2+x+1}{x^7+3x^2+2}\)
Quy đồng các phân thức
A. -7\x^2-4; 11\2x+4
B. 2\9x^2-1; 4x \1-3x
C.3\x+2;x+1\x^3+8;x+2\2x+4
1.Giải pt sau:(sqrt{2} +2)(xsqrt{2} -1)2xsqrt{2} -sqrt{2}
2.Cho pt: 2(a-1).x-a(x-1)2a+3
3.Giải pt sau:
a) frac{2}{x+frac{text{1}}{text{1}+frac{x+text{1}}{x-2}}}frac{6}{3x-text{1}}
b) frac{frac{x+text{1}}{x-text{1}}-frac{x-text{1}}{x+text{1}}}{text{1}+frac{x+text{1}}{x-text{1}}}frac{x-text{1}}{2left(x+text{1}right)}
Đọc tiếp
1.Giải pt sau:(\(\sqrt{2}\) +2)(x\(\sqrt{2}\) -1)=2x\(\sqrt{2}\) -\(\sqrt{2}\)
2.Cho pt: 2(a-1).x-a(x-1)=2a+3
3.Giải pt sau:
a) \(\frac{2}{x+\frac{\text{1}}{\text{1}+\frac{x+\text{1}}{x-2}}}=\frac{6}{3x-\text{1}}\)
b) \(\frac{\frac{x+\text{1}}{x-\text{1}}-\frac{x-\text{1}}{x+\text{1}}}{\text{1}+\frac{x+\text{1}}{x-\text{1}}}=\frac{x-\text{1}}{2\left(x+\text{1}\right)}\)