a) + 7 = a(1+2a)
b) 3a(a – 1) = a(3a-2)
c) 2a – + a(2 + a)= a + 18
d) + 5 = 5a(0,2a + 3)
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+ 7 = a +
- a - = -7
-a = -7 |:(-1)
a = 7
-3 = - 2a
- +2a = 3
2a = 3 |:2
a =
a) + 7 = a(1+2a)
2a²+7=a+2a²
2a²-2a²-a=-7
-a=-7 /:(-1)
a=7
b) 3a(a – 1) = a(3a-2)
3a²-3=3a²-2a
3a²-3a²+2a=3
2a=3 /:2
a= 1½
c) 2a – + a(2 + a)= a + 18
2a-a²+2a+a²=a+18
-a=18 /:(-1)
a=-18
d) + 5 = 5a(0,2a + 3)
a²+5=a²+15a
a²-a²-15a=-5
-15a=-5 /:(-15)
a=⅓
Pozdrawiam M:)