1.uprość wyrażenie:
(5y+1)(1-5y)-(1+5y)²=
2.obl. wartosc wyrazenia:
(√5 +1)² - (√5-x)² + (x+√5 )(√5-x) dla x= √5 -1
3.obl.wartosc wyrazenia:
(x-y)(x+y) + (x+2y)(x-2y) dla x=√2, y=1-√3
4.rozwiaz rownanie:
4(½x-3)² - (2-x)² =0
5. rozwiaz nierownosc:
4(x-3)² < (1-2x)²
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1.
(5y+1)(1-5y)-(1+5y)²=(1+5y)(1-5y)-(1+5y)²=1-25y²-1-10y-25y²=-50y²-10y
2.
(√5 +1)² - (√5-x)² + (x+√5 )(√5-x) dla x= √5 -1
(√5+1)² - (√5-√5+1)²+5-x²=5+2√5+1-1+5-(√5-1)²=2√5+10-5+2√5-1=4√5+4
3.
(x-y)(x+y) + (x+2y)(x-2y) dla x=√2, y=1-√3
x²-y²+x²-4y²=2-(1-√3)² + 2-4(1-√3)²=2-1+2√3-3+2-4+8√3-12==10√3-16
4.
4(½x-3)² - (2-x)² =0
4*1/4x²-3x+9-4+4x-x²=0
x²-12x+36-4+4x-x²=0
-8x+32=0
-8x=-32
x=4
5.
4(x-3)² < (1-2x)²
4x²-24x+36 < 1-4x+4x²
4x²-4x²-24x+4x+36-1 < 0
-20x<-35
x>7/4