Question

Aaajutorrrrr. Unde e notat.
Dau coroana si 99 puncte

Answer 1

*****Mult succes! *****

Answer 2

x²=9604
x= √9604
x∈{-98,98}

0,09· x²= 60,84 | ÷0,09
         x² = 676
         x=√676
         x∈{-26,26}

0,(3) ·x²= $\frac{27}{196}$
$\frac{3}{9}$ ·x²= $\frac{27}{196}$
$\frac{1}{3}$ ·x²=$\frac{27}{196}$
x²=$\frac{27}{196}$ ÷$\frac{1}{3}$
x² =$\frac{27}{196}$ ·$\frac{3}{1}$
x² = $\frac{81}{196}$
x =√$\frac{81}{196}$
x∈{-$\frac{9}{14}$, $\frac{9}{14}$}

0,25· x²= 0,01
$\frac{25}{100}$ · x²=$\frac{1}{100}$
x²= $\frac{1}{100}$ ÷$\frac{25}{100}$
x²=  $\frac{1}{100}$ ·$\frac{100}{25}$
x²= $\frac{1}{25}$
x=√$\frac{1}{25}$
x∈{-$\frac{1}{5}$,$\frac{1}{5}$}

- 0,6· x²= 1,(6)
- $\frac{6}{10}$ ·x²= $\frac{16-1}{9}$
- $\frac{3}{5}$· x²= $\frac{15}{9}$
x²= $\frac{15}{9}$ ÷(- $\frac{3}{5}$)
x² = $\frac{15}{9}$ ·(- $\frac{5}{3}$)
x²= - $\frac{25}{9}$
x∈Ф

25 ·√x⁴ = 4
√x⁴= $\frac{4}{25}$
x² = $\frac{4}{25}$
x = √$\frac{4}{25}$
x∈ { - $\frac{2}{5}$, $\frac{2}{5}$}