rút gọn 8\15
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\(\sqrt{8-2\sqrt{15}}=\sqrt{\left(\sqrt{5}-\sqrt{3}\right)^2}=\left|\sqrt{5}-\sqrt{3}\right|=\sqrt{5}-\sqrt{3}\)
\(\sqrt{8+2\sqrt{15}}\)
\(=\sqrt{3+2\sqrt{15}+5}\)
\(=\sqrt{\left(\sqrt{3}\right)^2+2\cdot\sqrt{3}\cdot\sqrt{5}+\left(\sqrt{5}\right)^2}\)
\(=\sqrt{\left(\sqrt{3}+\sqrt{5}\right)^2}\)
\(=\left|\sqrt{3}+\sqrt{5}\right|\)
\(=\sqrt{3}+\sqrt{5}\)
\(=\sqrt{5+2\cdot\sqrt{5}\cdot\sqrt{3}+3}\)
=căn (căn 5+căn 3)^2
=căn 5+căn 3
8/15 + 2/3 = 18/15
Rút gọn kết quả thành 6/5
3/7 + 4/8 = 52/56
Rút gọn kết quả thành 13/14
8/15+2/3=8/15+10/15=18/15=6/5
3/7+4/8=24/56+28/56=52/56=13/14
\(\frac{15x8+15x4}{12x3}\)
\(=\frac{15x\left(8+4\right)}{12x3}\)
\(=\frac{15x12}{12x3}=\frac{15}{3}=5\)
4: \(\sqrt{8+2\sqrt{15}}-\sqrt{8-2\sqrt{15}}\)
\(=\sqrt{5}+\sqrt{3}-\sqrt{5}+\sqrt{3}\)
\(=2\sqrt{3}\)
4) \(\sqrt{8+2\sqrt{15}}-\sqrt{8-2\sqrt{15}}\)
\(=\sqrt{5}+\sqrt{3}-\left(\sqrt{5}-\sqrt{3}\right)=2\sqrt{3}\)
5) \(\sqrt{5+2\sqrt{6}}+\sqrt{8-2\sqrt{15}}\)
\(=\sqrt{2}+\sqrt{3}+\sqrt{5}-\sqrt{3}=\sqrt{2}+\sqrt{5}\)
A=\(\sqrt{5-2\sqrt{3}.\sqrt{5}+3}-\sqrt{5+2\sqrt{5}.\sqrt{3}+3}\)
A=\(\sqrt{\left(\sqrt{5}-\sqrt{3}\right)^2}-\sqrt{\left(\sqrt{5}+\sqrt{3}\right)^2}\)
A=\(\sqrt{5}-\sqrt{3}-\sqrt{5}-\sqrt{3}\)
A=\(-2\sqrt{3}\)
\(A=\sqrt{8-2\sqrt{15}}-\sqrt{8+2\sqrt{15}}\)
\(A=\sqrt{\left(\sqrt{5}-\sqrt{3}\right)^2}-\sqrt{\left(\sqrt{5}+\sqrt{3}\right)^2}\)
\(A=\left|\sqrt{5}-\sqrt{3}\right|-\sqrt{5}-\sqrt{3}\)
\(A=\sqrt{5}-\sqrt{3}-\sqrt{5}-\sqrt{3}\)
\(A=-2\sqrt{3}\)
8/15+2/3=18/15
3/7+4/8=52/56=13/14
duyet nha dung 1000000000%
\(a.-\dfrac{8}{12}=\dfrac{-2\cdot4}{4\cdot3}=-\dfrac{2}{3}\)
\(b.\dfrac{15}{-60}=\dfrac{15}{15\cdot-4}-\dfrac{1}{4}\)
\(c.\dfrac{-16}{-72}=\dfrac{-2\cdot8}{-9\cdot8}=\dfrac{2}{9}\)
\(d.\dfrac{35}{14\cdot15}=\dfrac{7\cdot5}{7\cdot2\cdot5\cdot3}=\dfrac{1}{6}\)
\(\dfrac{8}{12}\)=\(\dfrac{2}{31}\)
\(\dfrac{15}{-60}\)=\(\dfrac{-1}{4}\)
\(\dfrac{-16}{72}\)=\(\dfrac{-2}{9}\)
\(\dfrac{35}{14.15}=\dfrac{35}{210}=\dfrac{1}{6}\)
Rút gọn
\(\dfrac{8}{15}=\dfrac{8}{15}\)
Phân số tối giản rồi nha bạn