решите уравнение:
(9x-3,6) x (-0.5) = -7x +2.1
(9x^2-3,6x)*(-0.5)=-7x+2.1
-4.5x^2-1.8x+7x-2.1=0
-4.5x^2+6.2x-2.1=0
D=38.44-37.8=0.64
x=-6.2-0.8/2 =2.7
x=6.2+0.8/2=3.5
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Answers & Comments
(9x^2-3,6x)*(-0.5)=-7x+2.1
-4.5x^2-1.8x+7x-2.1=0
-4.5x^2+6.2x-2.1=0
D=38.44-37.8=0.64
x=-6.2-0.8/2 =2.7
x=6.2+0.8/2=3.5