初二數(shù)學下冊平行四邊形教學視頻

證明:

三角形中，根據正弦定理:

a/sinA=b/sinB=c/sinC

設a與b不等，

a/b=sinA/sinB不等于1

sinA，sinB不相等

角A，B不等。

得證。

。。你買書就有送的啊

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淘寶上有賣的

I watched “Gone with the Wind” during my winter school ***.It’s an old classic movie and I like it very much.I especially Scarlett O’Hara,a strong willed Southern girl,who,when facing the total destruction of her family’s plantation by the Yankee troops and the cold feel from her husband Rhett Butler,showed her strong will that she will survive,and will not go hungry for another day.Because “after all,tomorrow is another day!”

視屏沒有書就有

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