第1个回答 2022-03-11
1.<2.<3.<4.=
根据log相加减公式:
log(a)(MN)=log(a)(M)+log(a)(N);
log(a)(M/N)=log(a)(M)-log(a)(N)
(1).log(7)(2)+log(7)(1/2)
=log(7)(2×1/2)
=0
(2)log(3)(18)-log(3)(2)
=log(3)(18/2)
=2
(3)2log(5)(10)+log(5)(0.25)
=log(5)(100×0.25)
=2
(4)=lg(0.25/25)
=-2