[题目]-|||-已知 (overline (A))=0.3, (overline (B))=0.4P(overline (AB))=0.5, 求条件概率-|||-(B|Acup B).

4.计算下列各行列式:-|||-4 -|||-(1) 1 2 2-|||-10 5 -|||-0 1 1 7-|||-2 1 -|||-(2) 3 -1 2 1-|||-1 2 -|||-5 0 -|||--ab ac ae-|||-(3) bd -cd de-|||-bf cf -ef-|||-1 1 1-|||-(4) a b-|||-b+c c+ a a+b-|||-a 1 0 0-|||-(5) -1 b 1 0-|||-0 -1 C 1-|||-0 0 -1 d-|||-1 2 3 4-|||-(6) 1 3 4 1-|||-1 4 1 2-|||-1 1 2 3

一头蓝鲸体重150t,体长25.9m。一棵巨杉的质量是这头蓝鲸体重的18.7倍,高是这头蓝鲸体长的3.2倍。这棵巨杉重多少吨?高多少米?

1.3 解方程组 ) 2(z)_(1)-(z)_(2)=i (1+i)(z)_(1)+i(z)_(2)=4-3i .

已知 (overline (A))=0.3 (B)=0.4, (Aoverline (B))=0.5, 求 (B|Acup overline (B))..

请你平移3颗棋子，使三角形颠倒过来。(可以用箭头标示。)bigcirc bigcirc bigcirc bigcirc -|||-bigcirc bigcirc bigcirc -|||-bigcirc bigcirc -|||-bigcirc

1、已知方程x+1+i(y-3)=(1+i)(5+3i)，则x=____，y=____。

计算行列式 1 2 3 4-|||-1 0 1 2-|||-3 -1 -1 0-|||-1 2 0 __-5

2.根据 times 39=2535, 在下面的括号里填上合适的数。-|||-25.35= () × () = () times ()-|||-2.535= () × () = () times ()-|||-253.5= () × () = () times ()-|||-0.2535= () times () = () times ()

先计算，再验算． 0.39×2.9 0.58×0.08 3.7×200 0.18×8.45 4.5×0.002 0.072×0.15．

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