\(50-\left[\left(50-2^3\cdot5\right)\div2+3\right]=50-\left[10\left(5-2^2\right)\div2+3\right]=50-\left(5\cdot1+3\right)=50-8=42\)
50 - [( 50 - 23. 5) : 2 + 3 ]
<=> 50 - [( 50 - 40) : 2 + 3 ]
<=> 50 - ( 5 + 3 )
<=> 50 - 8
<=> 42
\(50-\left[\left(50-2^3\cdot5\right)\div2+3\right]=50-\left[10\left(5-2^2\right)\div2+3\right]=50-\left(5\cdot1+3\right)=50-8=42\)
50 - [( 50 - 23. 5) : 2 + 3 ]
<=> 50 - [( 50 - 40) : 2 + 3 ]
<=> 50 - ( 5 + 3 )
<=> 50 - 8
<=> 42
Tính tổng :\(S=1+\frac{1}{2}.\left(1+2\right)+\frac{1}{3}.\left(1+2+3\right)+\frac{1}{4}.\left(1+2+3+4\right)+....+\frac{1}{50}.\left(1+2+3+4+....+50\right)\)
Thực hiện phép tính:
C=\(-\dfrac{1}{3}\left(1+2+3\right)-\dfrac{1}{4}\left(1+2+3+4\right)-....-\dfrac{1}{50}\left(1+2+3+...+50\right)\)
các bạn gúp mình với nha!
(\(5^{19}:5^{17}+3\) ) :7 \(1200:2+6^2.2^1+18\) \(7^9:7^7-3^2+2^3.5^2\) \(1200:2+6^2.2^1+18\) \(80-\left\{50-\left[30-\left(6-2^{ }\right)^2\right]\right\}\) \(3^2.5-2^2.7+83\)\(\left(76+12+21\right)-\left(76+21\right)\)
\(3.5^2\)\(15.2^2\)\(26:2\)
\(1+\frac{1}{2}\left(1+2\right)+\frac{1}{3}\left(1+2+3\right)+.....+\frac{1}{50}\left(1+2+3+...+50\right)\)
Tính tổng
Tìm x biết:
\(a,\left(x-\dfrac{3}{4}\right)+50\%=\dfrac{1}{6}\)
\(b,\dfrac{1}{2}x-\dfrac{5}{6}x=\dfrac{7}{2}\)
\(c,\left(4-x\right)\left(3x+5\right)=0\)
\(d,\dfrac{x}{16}=\dfrac{50}{32}\)
\(e,\left(2x-3\right)+\dfrac{3}{2}=-\dfrac{1}{4}\)
\(\left(2018-\frac{2}{135}+\frac{1}{50}\right)-\left(1-\frac{7}{135}+\frac{4}{50}\right)-\left(5+\frac{5}{135}+\frac{3}{50}\right)\)
\(\left(3,6-2\dfrac{2}{5}\right).\dfrac{-5}{3}+3.\left(2\dfrac{1}{2}:50\%\right)\)
\(3.8.5^2+2.4^3.12+\left(2^3+3\right).6.4\)
\(600:\left\{450-\left[450-\left(2^3.5^2\right)\right]\right\}\)
\(50-\left[\left(20-2^3\right):2+34\right]\)