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tìm x biết \(\left(3.\left|x.\left(-24\right)\right|.7^{2019}\right)=2.7^{2020}.\frac{1}{2020}\)
17 tháng 3 2019 lúc 22:58
Tìm x, biết:
a) \(x-\left\{\left[-x-\left(x+3\right)\right]-\left[\left(x+2018\right)-\left(x+2019\right)\right]+21\right\}=2020\)
b) \(\frac{1}{x}-\left\{\frac{1}{2.4}+\frac{1}{4.6}+\frac{1}{6.8}+...+\frac{1}{2018.2020}\right\}=\frac{1}{2019}\)
Help me! ( tặng 2 - 3 tk )
\(2020^{2020}\times\left(7^{10}\times7^8-3\times2^4-2^{2020}\div2^{2020}\right)\)
Tìm x:
\(\frac{1}{2}\times x-\frac{3}{5}=\frac{-4}{5}\) B)\(\left(x-\frac{2}{3}\right)\div\frac{-3}{7}=\frac{-9}{14}\)
Tìm x,biết:
a) \(\frac{1}{2}.\left(2x+3\right)-\frac{1}{3}\left(5-3x\right)=\frac{3}{2}x+7\)
b) \(30.\left(2+x\right)-6.\left(x-5\right)-24.x=100\)
a/\(^{3+2^{x-1}=24-\left[4^2-\left(2^2-1\right)\right]}\)
b/(x+1)+(x+2)+(x+3)+....+(x+100)=205550
c/Ix-5I=18+2x(-8)
d/\(\left(3x-2^4\right).7^5=2.7^6.\frac{1}{2009^0}\)
Tìm x, biết:
\(A.\frac{1}{2}.\left(2x+3\right)-\frac{1}{3}\left(5-3x\right)=\frac{3}{2}x+7\)
\(B.30.\left(2+x\right)-6.\left(x-5\right)-24.x=100\)
Cho b=\(1-\frac{2017}{2019}+\left(\frac{2017}{2019}\right)^2-\left(\frac{2017}{2019}\right)^3+...+\left(\frac{2017}{2019}\right)^{2020}\)
Cmr b<0
Bài 1:tính giá trị biểu thức sau:Bleft(1-frac{1}{21}right).left(1-frac{1}{28}right).left(1-frac{1}{36}right)...left(1-frac{1}{1326}right) Bài 2 tìm x biếta,1frac{1}{30}:left(24frac{1}{6}-24frac{1}{5}right)-frac{1frac{1}{2}-frac{3}{4}}{4x-frac{1}{2}}left(-1frac{1}{15}right):left(8frac{1}{5}-8frac{1}{3}right)b,left|3x-frac{2}{5}right|frac{1}{35}+left|frac{-3}{7}right|c,-3frac{1}{2}-left(2x+frac{1}{2}right):left(-frac{3}{7}right)0d,left(x-4right).left(x+2right)le0với x thuộc zgiúp mk với
Đọc tiếp
Bài 1:tính giá trị biểu thức sau:
\(B=\left(1-\frac{1}{21}\right).\left(1-\frac{1}{28}\right).\left(1-\frac{1}{36}\right)...\left(1-\frac{1}{1326}\right)\)
Bài 2 tìm x biết
\(a,1\frac{1}{30}:\left(24\frac{1}{6}-24\frac{1}{5}\right)-\frac{1\frac{1}{2}-\frac{3}{4}}{4x-\frac{1}{2}}=\left(-1\frac{1}{15}\right):\left(8\frac{1}{5}-8\frac{1}{3}\right)\)
\(b,\left|3x-\frac{2}{5}\right|=\frac{1}{35}+\left|\frac{-3}{7}\right|\)
\(c,-3\frac{1}{2}-\left(2x+\frac{1}{2}\right):\left(-\frac{3}{7}\right)=0\)
\(d,\left(x-4\right).\left(x+2\right)\le0\)với x thuộc z
giúp mk với
a,\(\frac{1}{3}+\frac{-4}{3}:x=\frac{-5}{6}\)
b, \(\frac{1}{2}x\frac{3}{5}.\left(x-2\right)=3\)
c,\(\left(2-\frac{1}{3}x\right)2018=\left(2-\frac{1}{3}x\right)2020\)