2.5%X+(20-X)*2.25%=0.485
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2.5%X+(20-X)*2.25%=0.4852.5%X+(20-X)*2.25%=0.4852.5%X+(20-X)*2.25%=0.4852.5%X+20*2.25%-2.25%X=0.4850
2.5%X+(20-X)*2.25%=0.485
2.5%X+(20-X)*2.25%=0.485
2.5%X+(20-X)*2.25%=0.485
2.5%X+20*2.25%-2.25%X=0.485
0.25%X+20*2.25%=0.485
0.25%X=0.485-20*2.25%
0.25%X=0.485-0.45
0.25%X=0.035
X=14
2.5%x+(20-x)2.25%=0.485 不对应该是: 2.5%x+(20-x)2.25%=0.485 x——万元或者 2.5%x+(200000-x)2.25%=4850 x——元
asasdada
2.5%X+(20-X)*2.25%=0.485
x(x+2)(x+6)+20x+6=0
2x:16-2x=2.5x:20-2.5x x=爱克斯(未知数)
(x+2)(x-3)>0这个不等式的解集是不等式组x+2>0 与 x+20 x-30}={x/x>3}.{x/{x+2
X+2.5×2.25%X=56254=X-X20%
f(x)={x x≥0-x X
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