nêu cánh tính:
\(\frac{1}{4,5}+\frac{1}{3}\)
bài 1 : Tính
G=\(\frac{4,5:\left[47,375-\left(26\frac{1}{3}-18.0,75\right).2,4:0,88\right]}{17,81:1,37-23\frac{2}{3}:1\frac{5}{6}}\)
Tính :
\(G=\frac{4,5:\left[47,375-\left(26\frac{1}{3}-18,075\right)\cdot2,4:0,88\right]}{17,81:1,37-23\frac{2}{3}:1\frac{5}{6}}\)
Thực hiện phép tính: \(\frac{\left(3\sqrt{8}-6\sqrt{\frac{1}{2}}-2\sqrt{18}+3\sqrt{50}\right)}{\frac{1}{2}\sqrt{24,5}-\sqrt{4,5}+\frac{3}{4}\sqrt{12,5}}\)
Tính tổng : A = \(\frac{1}{4,5}+\frac{1}{5,6}+...+\frac{1}{48,49}+\frac{1}{49,50}\)
\(A=1.\left(\frac{1}{4}-\frac{1}{5}+...+\frac{1}{49}-\frac{1}{50}\right)\)
\(A=\frac{1}{4}-\frac{1}{50}=\frac{23}{100}\)
mk nhanh nhất
Thực hiện phép tính: \(\left(\sqrt{4,5}-\frac{1}{2}\sqrt{72}+5\sqrt{\frac{1}{2}}\right)\left(42\sqrt{\frac{25}{6}}-10\sqrt{\frac{3}{2}}-12\sqrt{\frac{98}{3}}\right)\)
\(\left(\sqrt{4,5}-\frac{1}{2}.\sqrt{72}+5\sqrt{\frac{1}{2}}\right).\left(42\sqrt{\frac{25}{6}}-10\sqrt{\frac{3}{2}}-12\sqrt{\frac{98}{3}}\right)\)
=\(\left(\frac{3\sqrt{2}}{2}-3\sqrt{2}+\frac{5\sqrt{2}}{2}\right).\left(35\sqrt{6}-5\sqrt{6}-28\sqrt{6}\right)\)
=\(\left(\frac{3\sqrt{2}-6\sqrt{2}+5\sqrt{2}}{2}\right).2\sqrt{6}\)
=\(2\sqrt{2}.\sqrt{6}=4\sqrt{3}\)
Thực hiện phép tính: \(\left(\sqrt{4,5}-\frac{1}{2}\sqrt{72}+5\sqrt{\frac{1}{2}}\right)\left(42\sqrt{\frac{25}{6}}-10\sqrt{\frac{3}{2}}-12\sqrt{\frac{98}{3}}\right)\)
Bài 3: Thực hiện phép tính a) \(\left(\frac{2}{5}\right)^{^2}+5\frac{1}{2}:\left(4,5-2\right)+\frac{2^3}{\left(-4\right)}\) b) \(\left(\frac{2}{5}\right)^{^2}+5\frac{1}{2}:\left(4,5-2\right)+\frac{2^3}{\left(-4\right)}\)
Bài 3 :
\(a,\left(\frac{2}{5}\right)^2+5\frac{1}{2}:\left(4,5-2\right)+\frac{2^3}{\left(-4\right)}\)
\(=\frac{4}{25}+\frac{11}{2}:\frac{5}{2}+\frac{8}{\left(-4\right)}\)
\(=\frac{4}{25}+\frac{11}{5}-2\)
\(=\frac{59}{25}-2\)
\(=\frac{9}{25}\)
b, Giống câu a
Học tốt
\(1\frac{1}{2}\) * \(1\frac{1}{3}\)* \(1\frac{1}{4}\)tính bằng cánh nhanh nhất
\(1\frac{1}{2}.1\frac{1}{3}.1\frac{1}{4}=\frac{3}{2}.\frac{4}{3}.\frac{5}{4}=\left(\frac{3}{2}.\frac{4}{3}\right).\frac{5}{4}=2.\frac{5}{4}=\frac{5}{2}\)
1 1/2*1 1/3*1 1/4
=3/2*4/3*5/4
=5/2
Thực hiện phép tính: \(\left(3\sqrt{8}-6\sqrt{\frac{1}{2}}-2\sqrt{18}+3\sqrt{50}\right)\div\left(\frac{1}{2}\sqrt{24,5}-\sqrt{4,5}+\frac{3}{4}\sqrt{12,5}\right)\)