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math F4
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最佳解答:
x+y=26...1 (x.y)/2=120...2 x.y=240...3 what are the x and y? Sol x+y=26 y=26－x xy=240 x(26－x)=240 26x－x^2=240 x^2－26x+240=0 x=(26+/-√(26^2－4*1*240))/2 =(26+/-√(－284))/2 =(26+/-2i√71)/2 =13+/-i√71 (1)x=13+i√71 =>y=13－i√71 (2)x=13－i√71 =>y=13+i√71
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math F4
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x+y=26...1 (x.y)/2=120...2 x.y=240...3 what are the x and y?最佳解答:
x+y=26...1 (x.y)/2=120...2 x.y=240...3 what are the x and y? Sol x+y=26 y=26－x xy=240 x(26－x)=240 26x－x^2=240 x^2－26x+240=0 x=(26+/-√(26^2－4*1*240))/2 =(26+/-√(－284))/2 =(26+/-2i√71)/2 =13+/-i√71 (1)x=13+i√71 =>y=13－i√71 (2)x=13－i√71 =>y=13+i√71
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