计算:(log4 9+log8 3)(log3 2+log9 2)-log1/3 4√81
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计算:(log4 9+log8 3)(log3 2+log9 2)-log1/3 4√81
log后面的第一个数都是小数字,最后边是81的4次方根
log后面的第一个数都是小数字,最后边是81的4次方根
![计算:(log4 9+log8 3)(log3 2+log9 2)-log1/3 4√81](/uploads/image/z/6006921-33-1.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%88log4+9%2Blog8+3%29%28log3+2%2Blog9+2%29-log1%2F3+4%E2%88%9A81)
要用到换底公式,以及对数运算法则
如
log4 9=2/2* log₂3=log₂3
log(1/3)⁴√81=-log₃⁴√81
(log4 9+log8 3)(log3 2+log9 2)-log1/3 (⁴√81)
=(log₂3+1/3*log₂3)(log₃2+1/2*log₃2)-[-1/4* log₃3³]
=(4/3*log₂3)* (3/2*log₃2)+3/4
=4/3*3/2(log₂3)*(log₃2)+3/4
=2+3/4
=11/4
如
log4 9=2/2* log₂3=log₂3
log(1/3)⁴√81=-log₃⁴√81
(log4 9+log8 3)(log3 2+log9 2)-log1/3 (⁴√81)
=(log₂3+1/3*log₂3)(log₃2+1/2*log₃2)-[-1/4* log₃3³]
=(4/3*log₂3)* (3/2*log₃2)+3/4
=4/3*3/2(log₂3)*(log₃2)+3/4
=2+3/4
=11/4
计算:(log4 9+log8 3)(log3 2+log9 2)-log1/3 4√81
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