You______back into the burning house. You might have been badly burnt.A.mustn't goB.should
You______back into the burning house. You might have been badly burnt.
A.mustn't go
B.shouldn't go
C.needn't have gone
D.shouldn't have gone
You______back into the burning house. You might have been badly burnt.
A.mustn't go
B.shouldn't go
C.needn't have gone
D.shouldn't have gone
证明下列各式. (1)f1(t)*f2(t)=f2(t)*f1(t); (2)f1(t)*[f2(t)*f3(t)]=f3(t)*[f1(t)*f2(t)]; (3)a[f1(t)*f2(t)]=[af1(t)]*f2(t)=f1(t)*[af2(t)](a为常数); (4)eat[f1(t)*f2(t)]=[eatf1(t)]*[eatf2(t)](a为常数); (5)[f1(t)+f2(t)]*[g1(t)+g2(t)]=f1(t)*g1(f)+f2(t)*g1(t)+f1(t)*g2(t)+f2(t)*g2(t);
(7)f(t)*δ(t)=f(t); (8)f(t)*δ(t—t0)=f(t—t0); (9)f(t)*δ’(t)=f’(t);
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