谁有matlab或mathematics帮我解下两个方程1:105.8=0.003*a+5*b392=0.008*a+2*d470.4=9*b+d+2*c888.8+5*b+c+d=0.999a2:52.5＝x*10^(6.95805-1346.773/(y+219.693))97.5=(1-x)*10^(7.06623-1507.434/(y+214.985))thanks
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谁有matlab或mathematics帮我解下两个方程1:105.8=0.003*a+5*b392=0.008*a+2*d470.4=9*b+d+2*c888.8+5*b+c+d=0.999a2:52.5＝x*10^(6.95805-1346.773/(y+219.693))97.5=(1-x)*10^(7.06623-1507.434/(y+214.985))thanks
谁有matlab或mathematics帮我解下两个方程
1:
105.8=0.003*a+5*b
392=0.008*a+2*d
470.4=9*b+d+2*c
888.8+5*b+c+d=0.999a
2:
52.5＝x*10^(6.95805-1346.773/(y+219.693))
97.5=(1-x)*10^(7.06623-1507.434/(y+214.985))
thanks
谁有matlab或mathematics帮我解下两个方程1:105.8=0.003*a+5*b392=0.008*a+2*d470.4=9*b+d+2*c888.8+5*b+c+d=0.999a2:52.5＝x*10^(6.95805-1346.773/(y+219.693))97.5=(1-x)*10^(7.06623-1507.434/(y+214.985))thanks
s=solve('105.8=0.003*a+5*b','392=0.008*a+2*d',...
'470.4=9*b+d+2*c','888.8+5*b+c+d=0.999*a')
s =
a:[1x1 sym]
b:[1x1 sym]
c:[1x1 sym]
d:[1x1 sym]
>> s.a
ans =
1230.9797263557375411964446219914
>> s.b
ans =
20.421412164186557475282133226805
>> s.c
ans =
47.76560471387196644362328972336
>> s.d
ans =
191.07608109457704983521422151203
>> f=solve('52.5=x*10^(6.95805-1346.773/(y+219.693)),97.5=(1-x)*10^(7.06623-1507.434/(y+214.985))')
f =
x:[1x1 sym]
y:[1x1 sym]
>> f.y
ans =
86.012332547429901454968924587361
>> f.x
ans =
0.14708573837127572260795599716737
NSolve[{105.8 == 0.003*a + 5*b,
392 == 0.008*a + 2*d,
470.4 == 9*b + d + 2*c,
888.8 + 5*b + c + d == 0.999 a}, {a, b, c, d}]
{{a -> 1230.98, b -> 20.4214, c -> 47.7656, d -> 191.076}}
第二个死活弄不出来。。。