△ 407 次の計算をせよ。
2
14log: 3-log: 18
(3)* log20.5 log40.5-logs 0.5
(5) (logs 25+ log, 5) (log59+ log253)
(7) (log62)2+log62. log69+ (log63)²
(2) log 1 (3-√5) + log1 (3+√5
log,29+log23-log½ 243
(4),
1
(6) log26 log36-(log23+ log32)
(8)* log37 (log29-log43) log72