1)(1/9)x²z²-a²=(xz/3+a)(xz/3-a)
2)y²-163=(y+√163)(y-√163)
3)100-9b²=10²-(3b)²=(10+3b)(10-3b)
4)c²d²-81x²=(cd)²-(9x)²=(cd+9x)(cd-9x)
5)4a²/25-9b²c²=(2a/5)²-(3bc)²=(0,4a)²-(3bc)²=(0,4a+3bc)(0,4a-3bc)
(? 2)y²-169=y²-13²=(y+13)(y-13))
5-11х= -2x²
2x²-11x+5=0
D=121-40=81
x<span>1=11-9/10=2/10=0.2
x2=11+9/10=20/10=2
</span>9x²<span>-24х= -16
</span>9x²-24x+16=0
k=12
D=144-144=0;D=0
x=24:18=4/3
6x²<span>-4=0
</span>6x²=4
x²=2/3
x=+-√2/3
X (x-z) +(z-x) 6 = x (x-z) - (x-z) 6 = (x-z) (x-6)
Програму photomaths скачай на телефон
x y два числа
(x+y)/2 = 7
x^2- y^2=14
x+y = 14
(x-y)(x+y) = 14
x-y=1
2x = 15
x=7.5
y=6.5
x^2+y^2 = 56.25 + 42.25 = 98.5