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\(\left(2+x\right)+\left(4+x\right)+\left(6+x\right)+...+\left(52+x\right)=780\)
\(\Leftrightarrow26x+\left(2+4+6+...+52\right)=780\)
\(\Leftrightarrow26x+\left[\left(52+2\right).26:2\right]=780\)
\(\Leftrightarrow26x+702=780\)
\(\Leftrightarrow26x=78\)
\(\Leftrightarrow x=\frac{78}{26}=3\)
Ta có:
\(2^x.4=128\Rightarrow2^x=128:4=32\Rightarrow2^x=2^5\Rightarrow x=5.\) |
\(x^{15}=x\Rightarrow x=\left\{0;1;-1\right\}\) |
\(\left(x-5\right)^5=\left(x-5\right)^6\) \(\Rightarrow x-5\in\left\{0;1;-1\right\}\) \(\Rightarrow x=\left\{5;6;4\right\}\) |
\(\frac{-5}{3}\) | ||||
\(\frac{3}{4}\) | \(\frac{7}{10}\) | |||
\(\frac{-17}{30}\) |
x + (-98) = 57 | x = 155 |
x : 6 = -48 | x = -288 |
x . ( - 42) = -84 | x = 2 |
hok tốt!!!
\(\frac{-3}{4}.\frac{2}{11}+\frac{3}{4}.\frac{9}{11}+2\frac{3}{4}\)
\(=\frac{3}{4}.\frac{-2}{11}+\frac{3}{4}.\frac{9}{11}+2+\frac{3}{4}\)
\(=\frac{3}{4}.\left(\frac{-2}{11}+\frac{9}{11}+1\right)+2\)
\(=\frac{3}{4}.\frac{18}{11}+2\)
\(=\frac{3.2.9}{2.2.11}+2\)
\(=\frac{3.9}{2.11}+2\)
\(=\frac{27}{22}+\frac{2}{1}\)
\(=\frac{27}{22}+\frac{44}{22}\)
\(=\frac{71}{22}\)
\(=3\frac{5}{22}\)
Chúc bạn học tốt!!!