1) 2x-3y-11x+8y
2x-11y=3y-8y
-9x=-5y
2) 5(2a+1)-3
10a+5-3
10a=-5+3
10a=-2
a=10/(-2)
a=-5
3) 14x-(x-1)+(2x+6)
14x-x-1+2x+6=0
14x-x+2x=1-6
15x=-5
x=15/(-5)
x=-3
42-7/6=252-7/6=245/6=40,5/6
1) (12.0765 + 2.1725)/2 = 7.1245 = 7.12
2) (0.2614 + 1.012 + 2.3):3 = 1.19
3) (1001 + 10.10 + 0.001)/3 = 337.03
4) (56.03 + 4.35 + 0.2 + 150.0027)/4 = 52.645675 = 52.65
(12m - 5m) * 4 = 252
7m * 4 = 252
7m = 252 : 4
7m = 63
m = 63 : 7
m = 9
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Проверка: (12 * 9 - 5 * 9) * 4 = 252
(108 - 45) * 4 = 252
63 * 4 = 252
252 = 252