График приложен. Проходит через А.
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36x^2-25=0
(6x-5)(6x+5)=0
6x-5=0 U 6x+5=0
x=5/6 U x=-5/6
Ответ:x1=-5/6; x2=5/6
2(8-3x)+1=4-9x
16-6x+1=4-9x
-6x+9x=4-1-16
3x=-13
x=-4,3
вроде так
14b+(b+7)(b-7)+(b-7)^2=14b+b^2-49+b^2-14b+49=2b^2
3,21 : 0.3 + 2.42 =10.7 + 2.42 = 13.12
5 : 0.2 - 13 = 25 - 13 = 12
1/4 + 3.17 = 0.25 + 3.17 = 3.42
5/7 + 1/3 + 1/21 = 15/21 + 7/21 - 1/21 = 21/21 = 1
3/5 - 3/8 = 24/40 - 15/40 = 9/40 = 0.225
9/7 : 3/28 = (9 * 28) : (7*3) = 252/21 = 12
2/5 - 0.52 * 5/26 = 0.4 - 2.6/26 = 0.4 -0.1 = 0.3