Lê Minh Vũ
Giới thiệu về bản thân
\(1985-897-103\)
\(=1088-103\)
\(=985\)
\(2x-\dfrac{1}{5}=x\dfrac{2}{3}\)
\(2x-\dfrac{1}{5}-x\dfrac{2}{3}=0\)
\(2x-\dfrac{1}{5}-\dfrac{2}{3}x=0\)
\(2x-\dfrac{2}{3}x-\dfrac{1}{5}=0\)
\(\dfrac{4}{3}x=\dfrac{1}{5}\)
\(x=\dfrac{3}{20}\)
Dãy trên có số số hạng là:
\(\left(23-1\right)\div2+1=12\) ( số hạng )
Tổng của dãy trên là:
\(\left(23+1\right)\times12\div2=144\)
Đáp số: \(144\)
\(\dfrac{1}{5}\times x-\dfrac{2}{3}=\dfrac{1}{10}\times x+\dfrac{5}{6}\)
\(\dfrac{1}{5}x-\dfrac{2}{3}-\dfrac{1}{10}x-\dfrac{5}{6}=0\)
\(\dfrac{1}{5}x-\dfrac{1}{10}x-\dfrac{2}{3}-\dfrac{5}{6}=0\)
\(\dfrac{1}{10}x-\dfrac{3}{2}=0\)
\(\dfrac{1}{10}x=\dfrac{3}{2}\)
\(x=15\)
\(4^3\times27-4^3\times23\)
\(=4^3\times\left(27-23\right)\)
\(=64\times4\)
\(=256\)
\(3^4\times71+3^4\times2^9\)
\(=3^4\times\left(71+2^9\right)\)
\(=81\times\left(71+512\right)\)
\(=81\times583\)
\(=47223\)
\(\left(3^3\times5^2-2^4-16\right)\times13\)
\(=\left(27\times25-16-16\right)\times13\)
\(=\left(675-16-16\right)\times13\)
\(=\left(659-16\right)\times13\)
\(=643\times13\)
\(=8359\)
\(35\times273+33\times35\)
\(=35\times\left(273+33\right)\)
\(=35\times306\)
\(=10710\)
\(2^3\times4^2+2^3\times84-40\)
\(=8\times16+8\times84-40\)
\(=8\times\left(16+84\right)-40\)
\(=8\times100-40\)
\(=800-40\)
\(=760\)
\(1+\dfrac{1}{3}+1\dfrac{3}{4}\div2\dfrac{1}{2}+\dfrac{2}{3}\)
\(=1+\dfrac{1}{3}+\dfrac{7}{4}\div\dfrac{5}{2}+\dfrac{2}{3}\)
\(=1+\dfrac{1}{3}+\dfrac{7}{10}+\dfrac{2}{3}\)
\(=\left(1+\dfrac{7}{10}\right)+\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)
\(=\dfrac{17}{10}+1\)
\(=\dfrac{27}{10}\)
Cho mình sửa lại thành phân số:
1 yến = \(\dfrac{1}{10}\) tạ
1 tạ = \(\dfrac{1}{10}\) tấn
1 yến = 0,1 tạ
1 tạ = 0,1 tấn
\(Q=375\div125+47\times5-5^3\)
\(Q=3+235-125\)
\(Q=238-125\)
\(Q=113\)
\(4\times5^3-6\times3^2\)
\(=4\times125-6\times9\)
\(=500-54\)
\(=446\)
\(\left[4^2+\left(15-3^2\right)^2\right]\div13\)
\(=\left[16+\left(15-9\right)^2\right]\div13\)
\(=\left[16+6^2\right]\div13\)
\(=\left(16+36\right)\div13\)
\(=52\div13\)
\(=4\)