В1. (4a²-25b²)+(36b²-9a²)= -8a²+11b²
B2 36x²-1-36x²-12x=-4
-1-12x=-4
-12x=-3
x=4
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В1. (4a²-25b²)+(36b²-9a²)= -8a²+11b²
B2 36x²-1-36x²-12x=-4
-1-12x=-4
-12x=-3
x=4
... =(2а)^2-(5b)^2+(6b)^2-(3a)^2=4a^2-25b^2+36b^2-9a^2=11b^2-5a^2
B2.
...
(6x)^2-1^2-36x^2+12x=-4
36x^2-1-36x^2+12x=-4
12x-1=-4
12x=-4+1
12x=-3
X=-3:12=-1/4=-0,25