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DEj2
@DEj2
June 2021
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Решите,пожалуйста на завтра нужно.- 1)-2x²-0,5x+1,5; 2)-1,2m²+2,6m-1; 3)4b²-11b-3 4)0,3m²-3m+7,5.
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tamarabernukho
-2x²-0,5x+1,5=0
2x²+0,5x-1,5=0
D=1/4+4*2*1.5=(3.5)^2
x1=(-0.5-3.5)/4=-1
x2=(-0.5+3.5)/4=0.75
-1,2m²+2,6m-1=0
1.2m²-2.6m+1=0
D=6.76-4.8=1.96
x1=(2.6+1.4)/2.4=1 2/3
x2=(2.6-1.4)/2.4=-0.5
4b²-11b-3 =0
D=121+4*4*3=121+48=169
x1=(11+13)/8=24/8=3
x2=(11-13)/8=-1/4=-0.25
0,3m²-3m+7,5=0 разделим на 0.3
m^2-10m+25=0
(m-5)^2=0
m=5
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Answers & Comments
2x²+0,5x-1,5=0
D=1/4+4*2*1.5=(3.5)^2
x1=(-0.5-3.5)/4=-1
x2=(-0.5+3.5)/4=0.75
-1,2m²+2,6m-1=0
1.2m²-2.6m+1=0
D=6.76-4.8=1.96
x1=(2.6+1.4)/2.4=1 2/3
x2=(2.6-1.4)/2.4=-0.5
4b²-11b-3 =0
D=121+4*4*3=121+48=169
x1=(11+13)/8=24/8=3
x2=(11-13)/8=-1/4=-0.25
0,3m²-3m+7,5=0 разделим на 0.3
m^2-10m+25=0
(m-5)^2=0
m=5