V X = X - 2
X > = 0
( V X ) ^2 = ( X - 2 ) ^2
X = x^2 - 4x + 4
X^2 - 5x + 4 = 0
D = 25 - 16 = 9 = 3^2
X1 = ( 5 + 3 ) : 2 = 4
X2 = ( 5 - 3 ) : 2 = 1
Х - 2 > 0 ; Х > 2 ; Ответ 4
1/5+1/9=14/45
14/45-5целых 1/3= -5целых 1/45
-5целых 1/45+5/9= -4целых 7/15
-4целых7/15-0.2= -4целых 2/3
А)0.75+0.8=1.55 б)1.34-0.16=1.18 в)0.15*4=0.6 г) (1.75-0.25)*27=40.5
<em>1) 742-28=714</em>
<em>2) 22575:301=75</em>
<em>3) 714:7=102</em>
<em>4) 75+102=177</em>
<em>5) 177-18=159</em>