1.oblicz wartość wyrażenia 2. uprościć wyrażenie

[ewe899]

1. W= \(\displaystyle{ \frac{(85 \frac{7}{30} - 83 \frac{5}{18}) :2 \frac{2}{3} }{0,04}}\)

2. uprościć a \(\displaystyle{ \neq \pm}\) 1

W=\(\displaystyle{ ( \frac{a}{a+1} +1):(1* \frac{3a ^{2} }{1-a^{2} })}\)

[agulka1987]

1.

\(\displaystyle{ =\frac{\left( \frac{2557}{30}-\frac{1499}{18}\right) : \frac{8}{3}}{\frac{4}{100} }= \frac{\left(\frac{7671}{90} - \frac{7495}{90} \right) \cdot \frac{3}{8}}{\frac{1}{25}} = \frac{176}{90} \cdot \frac{3}{8} \cdot 25 = \frac{55}{3} = 18\frac{1}{3}}\)


2.
\(\displaystyle{ = \frac{2a+1}{a+1} \cdot \frac{(1-a)(1+a)}{3a^2} = \frac{1+a-2a^2}{3a^2}}\)