(a²-16)/(a²-5a+4)=(a-4)(a+4)/(a-4)(a-1)=(a+4)/(a-1)
Dзнаменатель = 25-16=9
a12=((5+-3))/2= 4 1
2/9*x-1/3=4x+1/2
4x-2/9*x=-1/3-1/2
3 7/9*x=-5/6
x=-5/6:3 7/9=-5/6*9/34
x=-15/68
При х=-5
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4m7y-3c4b-0.1y6m+b6c-6ym+16cb=28my-3c×4b-1/10y×6m+b×6c-6ym+16cb=22my-12cb-1/10y×6m+b×6c+16cb=22my+4cb-1/10y×6m+b×6c=2(11my+2cb-1/10y×3m+b×3c)=2(11my+2cb-3/10my+3cb)=2(107/10my+5cb)=2(10.7my+5cb)