a)(3/4:2/3):3/5=???
b)3/4:(2/3:3/5)=???
c)(11/12:33/16):3/5=???
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a) \(A=\left(\dfrac{3}{4}:\dfrac{2}{3}\right):\dfrac{3}{5}=\left(\dfrac{3}{4}\cdot\dfrac{3}{2}\right)\cdot\dfrac{5}{3}=\dfrac{9}{8}\cdot\dfrac{5}{3}=\dfrac{15}{8}\)
b) \(B=\dfrac{3}{4}:\left(\dfrac{2}{5}:\dfrac{3}{5}\right)=\dfrac{3}{4}:\left(\dfrac{2}{5}\cdot\dfrac{5}{3}\right)=\dfrac{3}{4}:\dfrac{2}{3}=\dfrac{3}{4}\cdot\dfrac{3}{2}=\dfrac{9}{8}\)
c) \(C=\left(\dfrac{11}{12}:\dfrac{33}{16}\right)\cdot\dfrac{3}{5}=\left(\dfrac{11}{12}\cdot\dfrac{16}{33}\right)\cdot\dfrac{3}{5}=\dfrac{4}{9}\cdot\dfrac{3}{5}=\dfrac{4}{15}\)
a.
A=\(\left(\dfrac{3}{4}:\dfrac{2}{3}\right):\dfrac{3}{5}\)
=\(\left(\dfrac{3}{4}.\dfrac{3}{2}\right):\dfrac{3}{5}\)
=\(\dfrac{9}{8}:\dfrac{3}{5}\)
=\(\dfrac{9}{8}.\dfrac{5}{3}=\dfrac{45}{24}=\dfrac{15}{8}\)
b.
B=\(\dfrac{3}{4}:\left(\dfrac{2}{5}:\dfrac{3}{5}\right)\)
=\(\dfrac{3}{4}:\left(\dfrac{2}{5}.\dfrac{5}{3}\right)\)
=\(\dfrac{3}{4}:\dfrac{2}{3}=\dfrac{3}{4}.\dfrac{3}{2}\)
=\(\dfrac{9}{8}\)
c.
C=\(\left(\dfrac{11}{12}:\dfrac{33}{16}\right).\dfrac{3}{5}\)
=\(\left(\dfrac{11}{12}.\dfrac{16}{33}\right).\dfrac{3}{5}\)
=\(\dfrac{4}{9}.\dfrac{3}{5}=\dfrac{12}{45}\)
=\(\dfrac{4}{15}\)
\(1,A=-\dfrac{3}{4}.\left(0,125-1\dfrac{1}{2}\right):\dfrac{33}{16}-25\%\)
\(A=-\dfrac{3}{4}.\left(0,125-\dfrac{3}{2}\right):\dfrac{33}{16}-\dfrac{1}{4}\)
\(A=-\dfrac{3}{4}.\left(-\dfrac{11}{8}\right):\dfrac{33}{16}-\dfrac{1}{4}\)
\(A=\dfrac{33}{32}:\dfrac{33}{16}-\dfrac{1}{4}\)
\(A=\dfrac{33}{32}.\dfrac{16}{33}-\dfrac{1}{4}\)
\(A=\dfrac{1}{2}-\dfrac{1}{4}\)
\(A=\dfrac{2}{4}-\dfrac{1}{4}\)
\(A=\dfrac{1}{4}\)
1. So sánh
a) \(25^{50}\) và \(2^{300}\)
\(25^{50}=25^{1.50}=\left(25^1\right)^{50}=25^{50}\)
\(2^{300}=2^{6.50}=\left(2^6\right)^{50}=64^{50}\)
Vì \(25< 64\) nên \(25^{50}< 64^{50}\)
Vậy \(25^{50}< 2^{300}\)
b) \(625^{15}\) và \(12^{45}\)
\(625^{15}=625^{1.15}=\left(625^1\right)^{15}=625^{15}\)
\(12^{45}=12^{3.15}=\left(12^3\right)^{15}=1728^{15}\)
Vì \(625< 1728\) nên \(625^{15}< 1728^{15}\)
Vậy \(625^{15}< 12^{45}\)
1.So sánh
a)\(25^{50}\) và \(2^{300}\)
Ta có : \(2^{300}=\left(2^6\right)^{50}=64^{50}\)
Vì \(25^{50}< 64^{50}\) nên \(25^{50}< 2^{300}\)
b)\(625^{15}\) và \(12^{45}\)
Ta có : \(12^{45}=\left(12^3\right)^{15}=1728^{15}\)
Vì \(625^{15}< 1728^{15}\) nên \(625^{15}< 12^{45}\)
đéo biết!!! Nhưng đừng có chửa tui ngu nha!! Tại tui lười ấy!!
a. -3/4 x 12/-5 x (-25/6)=-15/2
b. -2 x -38/21 x -7/4 x (-3/8)=-19/8
c. (11/12: 33/16) x 3/5=4/15
d. 7/23 x [(-8/6)- 45/18]=-7/6