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Rút gọn B
rút gọn B
2 a. rút gọn biểu C = \(\dfrac{2x^{\text{2}}-x}{\text{x }-1}+\dfrac{x+1}{1-x}+\dfrac{2-x^2}{x-1}\)
b. Rút gọn biểu thức D = \(\left(\dfrac{1}{a-\sqrt{a}}+\dfrac{1}{\sqrt{\text{a}}-1}\right):\dfrac{\sqrt{\text{a}}+1}{a-2\sqrt{a}+1}\)
Vậy khi rút gọn một biểu thức hửu tỉ và một biểu thức chứa căn có tìm điều kiện xác định không?
a. Khi rút gọn biểu thức hửu tỉ có tìm điều kiện xác định không ? từ đó hãy rút gọn biểu thức M left(dfrac{1}{1+x}+dfrac{2x}{1-x^{text{2}}}right):left(dfrac{1}{x}-1right)b. Khi rút gọn biểu thức chứa căn có tìm điều kiện không ? từ đó hãy rút gọn biểu thức N dfrac{sqrt{x}+1}{sqrt{text{x}}-2}+dfrac{2sqrt{x}}{sqrt{x}+2}+dfrac{2+5sqrt{x}}{4-x}
Đọc tiếp
a. Khi rút gọn biểu thức hửu tỉ có tìm điều kiện xác định không ? từ đó hãy rút gọn biểu thức M = \(\left(\dfrac{1}{1+x}+\dfrac{2x}{1-x^{\text{2}}}\right):\left(\dfrac{1}{x}-1\right)\)
b. Khi rút gọn biểu thức chứa căn có tìm điều kiện không ? từ đó hãy rút gọn biểu thức N = \(\dfrac{\sqrt{x}+1}{\sqrt{\text{x}}-2}+\dfrac{2\sqrt{x}}{\sqrt{x}+2}+\dfrac{2+5\sqrt{x}}{4-x}\)
Rút gọn : A B C D
Đọc tiếp
Rút gọn :
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b) Rút gọn
2 x 2 - y 2 3 x 2 + 6 x y + 3 y 2 4
Rút gọn biểu thức P=A+B
cho phân số a/b.nếu rút gọn phân số đó thì được phân số 3/4.nếu cộng thêm 15 đơn vị vào tử rồi rút gọn thì được phân số 7/9.tìm a/b.
Rút gọn biểu thức:
b) 75 + 48 - 300