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共找到 4118 与by=ka 相关的结果，耗时4 ms

化学（请）已知25度时,电离平衡常数Ka（HF）=3.6×10^-4,溶度积常数Ksp（CaF2）=1.46×10^-10.现向1L0.2mol/LHF溶液中加入1L0.2mol/LCaCl2溶液,则下列说法是否正确?为什么?（1）该体系中Ksp（CaF2）=1/Ka（化学

a（HF）（2）该体系有Ca

电离常数ka=3)若25℃时,0.10mol•L—1的NaHSO4溶液中c(SO42—)=0.029mol•L—1,则HSO4—的电离常数Ka=(保留两位有效数字物理

已知|a|=1，|b|=4，且向量a与b不共线，（1）若a与b的夹角为60°，求（2a-b）•（a+b）；（2）若向量ka+b与ka-b互相垂直，求k的值．数学

已知向量a=（1,1）,向量b=（0,-2）,当k为何值时,ka-b与a+b的夹角为120°ka-b与a+b中的a、b为向量,打不出来~ 数学

I go to school on foot.She goes to school by bike.he goes to school by subway.I go to school on foot.She goes to school by bike.he goe 英语

to school by

The car was invented by him.对him进行提问怎么变?是by whom was the car invented?还是 whom was the car invented by?还是 by whom the car was invented? 英语

是以上都不对希望给出详解.b

若abxy满足ax+by=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+by^5的值数学

1.若a,b,x,y满足ax+by=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+by^5的值2.已知等式k²x+2(k-1)y+(2-k-k²)z=1与k值无关,求x,y,z的值数学

一道初中整式问题ax+by=7ax^2+by^2=49ax^3+by^3=133ax^4+by^4=406求2008（x+y）+2008xy+(a+b)/21 数学

"Being attacked by the man ,I called the police","Attacked by the man ,I called the police" 分别?1.Being attacked by the man ,I called t 英语

e police.2.Att

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