(x+y)t=(1.2x+y)·0.9t=(x+0.75y)(t+2.5),求t
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(x+y)t=(1.2x+y)·0.9t=(x+0.75y)(t+2.5),求t
(x+y)t=(1.2x+y)·0.9t=(x+0.75y)(t+2.5),求t
(x+y)t=(1.2x+y)·0.9t=(x+0.75y)(t+2.5),求t
(x+y)t=(1.2x+y)*0.9t 可得y=0.8x
带入其中可得1.8xt=1.6xt+4x可得 t=20
三个未知数,三个等式。
逐步消掉x,y最后就能得到
t=20