20*cos(0.05*x)
2x+y=1
y $^{2}$ -47y+550
5\frac{4}{5}+8\frac{1}{3}-\frac{23}{4}
221base2x=104base3x
0.01/10.428 *10^-5
49.1= A+B
A= $\frac{8}{100}$ (x)
B= $\frac{8}{100}$ (x-A)
5÷7
\(x^{2}+x-\frac{30}{x}-5=1\)
2.5/100*545
