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551002450129
@551002450129
August 2022
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1) (3x-1)(x+2)=20
2) (x-4)(4x-3)+3=0
3) (x-3)²+(x+4)²-(x-5)²=17x+24
4) (x+5)²+(x-2)²+(x-7)(x+7)=11x+80
СРОЧНОО ПОМАГИТЕ С РЕШЕНИЕМ КАК МОЖНО БЫСТРЕЙ
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ma220299
1) 3x²+5x-2=20
3x²+5x-2-20=0
3x²+5x-22=0
D=25+264=289
x=(-5⁺₋17)/6
x₁=(-5+17)/6=12/6=2
x₂=(-5-17)/6=-22/6=-3 целю 2/3
2) 4x²-19x+12+3=0
4x²-19x+15=0
D=361-240=121
x=(19⁺₋11)/8
x₁=(19+11)/8=30/8=3 целю 3/4
x₂=(19-11)/8=8/8=1
3) x²-6x+9+x²+8x+16-x²+10x-25=17x+24
x²+12x-17x-24=0
x²-5x-24=0
D=25+96=121
x=(5⁺₋11)/2
x₁=(5+11)/2=16/2=8
x₂=(5-11)/2=-6/2=-3
4) x²+10x+25+x²-4x+4+x²-49=11x+80
3x²+6x-20=11x+80
3x²+6x-20-11x-80=0
3x²-5x-100=0
D=25+1200=1225
x=(5⁺₋35)/6
x₁=(5+35)/6=40/6=6 целю 2/3
x₂=(5-35)/6=-30/6=-5
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Answers & Comments
3x²+5x-2-20=0
3x²+5x-22=0
D=25+264=289
x=(-5⁺₋17)/6
x₁=(-5+17)/6=12/6=2
x₂=(-5-17)/6=-22/6=-3 целю 2/3
2) 4x²-19x+12+3=0
4x²-19x+15=0
D=361-240=121
x=(19⁺₋11)/8
x₁=(19+11)/8=30/8=3 целю 3/4
x₂=(19-11)/8=8/8=1
3) x²-6x+9+x²+8x+16-x²+10x-25=17x+24
x²+12x-17x-24=0
x²-5x-24=0
D=25+96=121
x=(5⁺₋11)/2
x₁=(5+11)/2=16/2=8
x₂=(5-11)/2=-6/2=-3
4) x²+10x+25+x²-4x+4+x²-49=11x+80
3x²+6x-20=11x+80
3x²+6x-20-11x-80=0
3x²-5x-100=0
D=25+1200=1225
x=(5⁺₋35)/6
x₁=(5+35)/6=40/6=6 целю 2/3
x₂=(5-35)/6=-30/6=-5