“(lg8+lg1000)lg5+3(lg2)平方”怎么算计算“tan65+tan70+1-tan65tan70” 已知两条直线:L1:x+(3+m)y=2,L2:mx+y=-8,若L1垂直L2,则m=多少

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“(lg8+lg1000)lg5+3(lg2)平方”怎么算计算“tan65+tan70+1-tan65tan70” 已知两条直线:L1:x+(3+m)y=2,L2:mx+y=-8,若L1垂直L2,则m=多少
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“(lg8+lg1000)lg5+3(lg2)平方”怎么算计算“tan65+tan70+1-tan65tan70” 已知两条直线:L1:x+(3+m)y=2,L2:mx+y=-8,若L1垂直L2,则m=多少
“(lg8+lg1000)lg5+3(lg2)平方”怎么算
计算“tan65+tan70+1-tan65tan70” 已知两条直线:L1:x+(3+m)y=2,L2:mx+y=-8,若L1垂直L2,则m=多少

“(lg8+lg1000)lg5+3(lg2)平方”怎么算计算“tan65+tan70+1-tan65tan70” 已知两条直线:L1:x+(3+m)y=2,L2:mx+y=-8,若L1垂直L2,则m=多少
(lg8+lg1000)lg5+3(lg2)²
=(lg2³+lg10³)lg5+3(lg2)²
=(3lg2+3lg10)lg5+3(lg2)²
=(3lg2+3)lg5+3(lg2)²
=3lg2lg5+3lg5+3(lg2)²
=3lg2(lg2+lg5)+3lg5
=3lg2+3lg5
=3(lg2+lg5)
=3

(lg8+lg1000)lg5+3(lg2)平方
=(lg8+3)lg5+2lg2
=lg8+3(lg5+lg2)
=lg8+3