1.(8%-X)/(9%-X)=(4.661-5)/(5.604-5)2.X=10%X+800+1000
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1.(8%-X)/(9%-X)=(4.661-5)/(5.604-5)2.X=10%X+800+1000
1.(8%-X)/(9%-X)=(4.661-5)/(5.604-5)
2.X=10%X+800+1000
1.(8%-X)/(9%-X)=(4.661-5)/(5.604-5)2.X=10%X+800+1000
2 x-10%x=800+1000
90%x=1800
x=1800/90%
x=2000
1 (8%-X)/(9%-X)=(4.661-5)/(5.604-5)
(8%-X)(5.604-5)=(9%-X)(4.661-5)
(8%-X)*0.604=(9%-X)*(-0.339)
8%*0.604-0.604x=-9%*0.339+0.339x
0.339x+0.604x=0.064*8%+0.339*9%
0.943x=0.04832+0.03051
0.943x=0.07883
x=0.0836
2、(1-10%)x=1800
0.9x=1800
x=2000
1、x*x-0.17x+0.0072=(-0.339)/(0.604)
x*x-0.17x+0.085*0.085=-5.677
x不存在。
1解由题意得(8%—x)*0.604=(9%-x)*(-0.339)
0.943x=0.048+0.031
x=0.083
2解由题意得(1-0.1)x=1800
x=1620
1.(8%-X)/(9%-X)=(4.661-5)/(5.604-5)
(8%-x)(5.604-5)=(9%-X)(4.661-5)
-0.604X+0.04832= 0.339X-0.03051
0.943X= 0.07783
X=7883/94300(约为0.0836)
2.X=10%X+800+1000
(1-10%)X=1800
90%X=1800
X=1800÷90%
X=2000