Question

求这道题的过程，谢谢。

Answer 1

log(5)35-2log(5)7/3+log(5)7-log(5)1.8
=log(5)35-log(5)(7/3)²+log(5)7-log(5)1.8
=log(5)35-log(5)(49/9)+log(5)7-log(5)(18/10)
=log(5)[35÷(49/9)x7÷(9/5)]
=log(5)[35x(9/49)x7x(5/9)]
=log(5)[5x(9/7)x7x(5/9)]
=log(5)[5x9x(5/9)]
=log(5)[5x5]
=log(5)5²
=2log(5)5
=2

Answer 2

原式=log(5)35-log(5)49/9+log(5)7-log(5)1.8
=log(5)（35÷49/9x7÷9/5）
=log(5)(35x9/49x7x5/9)
log(5)5²
=2