23X +40=21X 设随身听4X-8,书包为X x-15%x=4250 13+X=2/1(47+x) x(1+15%)x90%-x=7
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![23X +40=21X 设随身听4X-8,书包为X x-15%x=4250 13+X=2/1(47+x) x(1+15%)x90%-x=7](/uploads/image/z/10366925-5-5.jpg?t=23X+%2B40%3D21X+%E8%AE%BE%E9%9A%8F%E8%BA%AB%E5%90%AC4X-8%2C%E4%B9%A6%E5%8C%85%E4%B8%BAX+x-15%25x%3D4250+13%2BX%3D2%2F1%2847%2Bx%29+x%281%2B15%25%29x90%25-x%3D7)
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23X +40=21X 设随身听4X-8,书包为X x-15%x=4250 13+X=2/1(47+x) x(1+15%)x90%-x=7
23X +40=21X 设随身听4X-8,书包为X x-15%x=4250 13+X=2/1(47+x) x(1+15%)x90%-x=7
23X +40=21X 设随身听4X-8,书包为X x-15%x=4250 13+X=2/1(47+x) x(1+15%)x90%-x=7
23X +40=21X
2X=-40
X=-20
x-15%x=4250
0.85x=4250
x=5000
13+x=2/1(47+x)
26+2x=47+x
x=21
x(1+15%)x90%-x=7
1.035x-x=7
0.035x=7
x=200
=-24÷2×(-3/4)x的(4-1+3)次方y的(5-5+2)次方
=9x的6次方y的2次方
F1F2=6
则0a=6,PF1+PF2=F1F2,所以是线段F1F2
a>6,即a>c,椭圆
所以ABC都有可能,选D