問(wèn)答題設(shè)η1,···,ηs是非齊次線性方程組Ax=b的s個(gè)解,k1,k2,···,ks,為實(shí)數(shù),滿足k1+···+k2=1,證明x=k1η1+k2η2+···+ksηs也是它的解.

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