rozwiaz rownanie:
3/4x + (3/4x - 1/20x) + 20 = x
2. co wieksze:
3/4 liczby 8/7 czy 5/9 liczby 3/2
3. oblicz liczbe której 5/9 jest równe 27 1/2
4. 2-1/4 : 2 - [(5/2) do 2 potegi + 3/2 * 5/4]
5. wzory skróconego mnozenia
2[m(m+2)² - (m+1)(m-1)] - 8m (m+1) =
(m+2n)²-3(m-2n)² - 5 (m+2n)²=
x²(x-2)=
(2x=3y)²+(x-2y)(x+2y)=
(3-√5)(3+√5)-(4+√3)=
2(√2-5)²-3(√2+3)²=
3(√5-4)=
(3+ 2√2)²=
a² + 2ab + b²=
9a² = 3a = 1/4
25 - 36x²=
16x²-8xy +y²=
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4.)
2 - 1/4 : 2 - [(5/2) do potęgi + 3/2 * 5/4] =
= 2 - 1/4 : 2 - [25/4 + 3/2 * 5/4] =
= 2 - 1/4 : 2 - [25/4 + 15/8] =
= 2 - 1/4 : 2 - [50/8 + 15/8] =
= 2 - 1/4 : 2 - 65/8 = 2 - 1/2 - 65/8 = 1 - 65/8 = 1 - 8 i 1/8 = -7 i 1/8
; ] .