\(VP=\dfrac{1}{2}\cdot\dfrac{a+2-a}{a\left(a+2\right)}=\dfrac{2}{2a\left(a+2\right)}=\dfrac{1}{a\left(a+2\right)}=VT\)
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Bài 6: Phép trừ các phân thức đại số
Các câu hỏi tương tự
a). Chứng minh: \(\dfrac{1}{x}-\dfrac{1}{x+1}=\dfrac{1}{x\left(x+1\right)}\)
b). Tính nhẩm tổng sau:
\(\dfrac{1}{x\left(x+1\right)}+\dfrac{1}{\left(x+1\right)\left(x+2\right)}+\dfrac{1}{\left(x+2\right)\left(x+3\right)}+\dfrac{1}{\left(x+3\right)\left(x+4\right)}+\dfrac{1}{\left(x+4\right)\left(x+5\right)}+\dfrac{1}{x+5}\)
a) Chứng minh :
dfrac{1}{x}-dfrac{1}{x+1}dfrac{1}{xleft(x+1right)}
b) Đố :
Đố em tính nhẩm được tổng sau :
dfrac{1}{xleft(x+1right)}+dfrac{1}{left(x+1right)left(x+2right)}+dfrac{1}{left(x+2right)left(x+3right)}+dfrac{1}{left(x+3right)left(x+4right)}+dfrac{1}{left(x+4right)left(x+5right)}+dfrac{1}{x+5}
Đọc tiếp
a) Chứng minh :
\(\dfrac{1}{x}-\dfrac{1}{x+1}=\dfrac{1}{x\left(x+1\right)}\)
b) Đố :
Đố em tính nhẩm được tổng sau :
\(\dfrac{1}{x\left(x+1\right)}+\dfrac{1}{\left(x+1\right)\left(x+2\right)}+\dfrac{1}{\left(x+2\right)\left(x+3\right)}+\dfrac{1}{\left(x+3\right)\left(x+4\right)}+\dfrac{1}{\left(x+4\right)\left(x+5\right)}+\dfrac{1}{x+5}\)
a)\(\dfrac{2}{x+2}-\dfrac{1}{x+3}+\dfrac{2x+5}{\left(x+2\right)\left(x+3\right)}\)
b)\(\dfrac{2}{x+1}-\dfrac{1}{x+5}+\dfrac{2x+6}{\left(x+5\right)\left(x+1\right)}\)
c)\(\dfrac{-6}{x^2-9}-\dfrac{1}{x+3}+\dfrac{3}{x-3}\)
d)\(\dfrac{x}{x-2}-\dfrac{x}{x+2}+\dfrac{8}{x^2-4}\)
Thực hiện các phép tính :
a) \(\dfrac{x+1}{x-3}-\dfrac{1-x}{x+3}-\dfrac{2x\left(1-x\right)}{9-x^2}\)
b) \(\dfrac{3x+1}{\left(x-1\right)^2}-\dfrac{1}{x+1}+\dfrac{x+3}{1-x^2}\)
5. a) \(\dfrac{4x+13}{5x\left(x-7\right)}-\dfrac{x-48}{5x\left(7-x\right)};\) b) \(\dfrac{1}{x-5x^2}-\dfrac{25x-15}{25x^2-1}\)
Đố :
Đố em tính nhanh được tổng sau :
\(\dfrac{1}{x\left(x+1\right)}+\dfrac{1}{\left(x+1\right)\left(x+2\right)}+\dfrac{1}{\left(x+2\right)\left(x+3\right)}+\dfrac{1}{\left(x+3\right)\left(x+4\right)}+\dfrac{1}{\left(x+4\right)\left(x+5\right)}+\dfrac{1}{\left(x+5\right)\left(x+6\right)}\)
Giá trị của biểu thức: A=\(\dfrac{a^2}{\left(a-b\right)\left(a-c\right)}-\dfrac{b^2}{\left(b-a\right)\left(c-b\right)}-\dfrac{c^2}{\left(c-a\right)\left(b-c\right)}\)
Tính :\(\dfrac{x+1}{x-1}-\dfrac{x_{ }-1}{x+1}\), Chọn đáp án đúng
A.\(\dfrac{-4x}{x^2-1}\) B.\(\dfrac{2\left(x+1\right)}{x-1}\) C.\(\dfrac{2\left(x^2+1\right)}{x^2-1}\) D. \(\dfrac{4x}{x^2-1}\)
1) thực hiện phép tính
a) dfrac{x-3}{4x+4}-dfrac{x-1}{6x-30}
b) dfrac{1}{x-5x^2}-dfrac{25x-15}{25x^2-1}
c) dfrac{x+9y}{x^2-9y^2}-dfrac{3y}{x^2-3xy}
d) dfrac{3x+1}{left(x-1right)^2}-dfrac{1}{x+1}-dfrac{x+3}{1-x^2}
e) dfrac{3left(x-2right)}{x^2-2x+1}-dfrac{6}{x^2-1}-dfrac{3x-2}{1-x^2}
Đọc tiếp
1) thực hiện phép tính
a) \(\dfrac{x-3}{4x+4}-\dfrac{x-1}{6x-30}\)
b) \(\dfrac{1}{x-5x^2}-\dfrac{25x-15}{25x^2-1}\)
c) \(\dfrac{x+9y}{x^2-9y^2}-\dfrac{3y}{x^2-3xy}\)
d) \(\dfrac{3x+1}{\left(x-1\right)^2}-\dfrac{1}{x+1}-\dfrac{x+3}{1-x^2}\)
e) \(\dfrac{3\left(x-2\right)}{x^2-2x+1}-\dfrac{6}{x^2-1}-\dfrac{3x-2}{1-x^2}\)