1) 32х-16х^2+16х^2-40х+25=0
-8х=-25
х=25/8;
2) 9у^2+54у-9у^2-6у-1+1=0
48у=0
3)0,5(х^2-12х+36)+2х(8-х)/4=2
0,5х^2-6х+18+ 16х-2х^2/4 -2=0
2х^2-24х+72+16х-2х^2-8=0
-8х=-64
х=8
4) у+25у^2+20у+4=50+25у^2
21у=46
у=46/21
1)<span> (-3,9*2,8+26,6):(-3,2)-2,1</span>
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<span><em>0,5: 0,01/0,8*25=50/20=2,5</em></span>
<span><em>Ответ:2,5</em></span>