Tính hợp lí:
11/25 . (-24,8) -11/25 .75,2
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\(\frac{11}{25}\)x(-24,8) -\(\frac{11}{25}\)x 75,2 = \(\frac{11}{25}\)x(-24,8-75.2) = \(\frac{11}{25}\)x (-100) = -44
T = \(\dfrac{\sqrt{5}\left(\sqrt{16}-\sqrt{9}\right)}{4-5}-5\sqrt{5}+\dfrac{1}{\sqrt{5}-2}+2\sqrt{5}\)
= \(-\sqrt{5}-5\sqrt{5}+2\sqrt{5}+\dfrac{1}{\sqrt{5}-2}\)
= \(-4\sqrt{5}+\dfrac{1}{\sqrt{5}-2}\)
= \(\dfrac{-4\sqrt{5}\left(\sqrt{5}-2\right)+1}{\sqrt{5}-2}\)
= \(\dfrac{-20+8\sqrt{5}+1}{\sqrt{5}-2}\)
= \(\dfrac{-19+8\sqrt{5}}{\sqrt{5}-2}\)
= \(\dfrac{19-8\sqrt{5}}{2-\sqrt{5}}\)
= \(\dfrac{\left(-2+3\sqrt{5}\right)\left(\sqrt{5}-2\right)}{-\left(\sqrt{5}-2\right)}=2-3\sqrt{5}\)
\(a,51+6-1-0,2=55,8\)
\(b,2511\times-24,8-2511\times75,2\)
\(=-24,8\times75,2=-100\)
\(=-251100\)
a, 51+6-1-0,2
=57-1;2
=55.8
b, 2511. -24,8 -2511.75,2
=2511.(-24,8 -75,2)
=2511.-100
=-251100
54x129-54x69+45x59
=54x(128-69)+46x59
=54x59+46x59
=59x(54+46)
=59x100
=5900
nhé
A=(-3/4+2/3).11/9+(-1/4+1/3):|-9/11|
\(=\left(-\frac{3}{4}+\frac{2}{3}\right).\frac{11}{9}+\left(-\frac{1}{4}+\frac{1}{3}\right).\frac{11}{9}\)
\(=\frac{11}{9}\left(-\frac{3}{4}+\frac{2}{3}-\frac{1}{4}+\frac{1}{3}\right)\)
\(=\frac{11}{9}\left(-1+1\right)\)
\(=\frac{11}{9}.0\)
=0
\(\frac{11}{25}\)\(\left(-24,8\right)-\frac{11.}{25}\)\(x75,2\)
\(\frac{11}{25}\)\(\left[\left(-24,8\right)-75,2\right]=\frac{11}{25}\)\(x\left(-100\right)=-44\)