在△ABC中，已知AB=AC，∠A=40°，P为AB上一点，∠ACP=20°，则=3．【考点】；．【专题】计算题．【分析】作AD⊥BC于点D，则点D是BC的中点，在△ABC外作∠CAE=20°，则∠BAE=60°，作CE⊥AE，PF⊥AE，从而证明△ACE≌△ACD，结合全等三角形的性质及含30°角直角三角形的性质可得出答案．【解答】解：作AD⊥BC于点D，则点D是BC的中点，在△ABC外作∠CAE=20°，则∠BAE=60°，作CE⊥AE，PF⊥AE，则CE=CD（角平分线的性质），在△ACE和△ACD中，∴△ACE≌△ACD（HL），所以CE=CD=BC．又因为PF=PAsin∠BAE=PAsin60=AP，PF=CE，所以 AP=BC，因此=．故答案为：．【点评】此题考查了全等三角形的判定与性质，解答本题的关键是正确作出辅助线，需要我们熟练全等三角形的判定及30°角直角三角形的性质．声明：本试题解析著作权属菁优网所有，未经书面同意，不得复制发布。答题：　难度：0.63真题：1组卷：10
解析质量好中差如图，在△ABC中，P为AB上一点，则下列四个条件中，（1）∠ACP=∠B（2）∠APC=∠ACB&&（3）AC2=APoAB&&（4）ABoCP=APoCB，其中能满足△APC和△ACB相似的条件有（　　）A．1个B．2个C．3个D．4个【考点】．【分析】两组对应角相等的三角形互为相似三角形，两组对应边成比例，夹角相等两个三角形互为相似三角形．【解答】解：（1）中，∠ACP=∠B，又有一公共角∠A，所以相似，（1）对；（2）∠APC=∠ACB，且有一公共角∠A，（2）对；（3）中 AC2=APoAB，∠A为其夹角，（3）对；（4）中不是两组对应边成比例，夹角相等，所以（4）不对．故选C．【点评】本题考查相似三角形的判定定理，关键知道两组对应角相等的三角形互为相似三角形，两组对应边成比例，夹角相等两个三角形互为相似三角形根据此可求出答案．声明：本试题解析著作权属菁优网所有，未经书面同意，不得复制发布。答题：　难度：0.64真题：6组卷：2
解析质量好中差From Wikipedia, the free encyclopedia
Identifiers
 ; HAAP
External IDs
:  :  :
Molecular function
Cellular component
Biological process
RNA expression pattern
RefSeq (mRNA)
RefSeq (protein)
Location (UCSC)
Low molecular weight phosphotyrosine protein phosphatase is an
that in humans is encoded by the ACP1 .
The product of this gene belongs to the phosphotyrosine protein phosphatase family of proteins. It functions as an acid phosphatase and a protein tyrosine phosphatase by hydrolyzing protein tyrosine phosphate to protein tyrosine and orthophosphate. This enzyme also hydrolyzes orthophosphoric monoesters to alcohol and orthophosphate. This gene is genetically polymorphic, and three common alleles segregating at the corresponding locus give rise to six phenotypes. Each allele appears to encode at least two electrophoretically different isozymes, Bf and Bs, which are produced in allele-specific ratios. Three transcript variants encoding distinct isoforms have been identified for this gene.
ACP1 has been shown to
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1c0e: Active Site S19A Mutant of Bovine Heart Phosphotyrosyl Phosphatase 
1dg9: CRYSTAL STRUCTURE OF BOVINE LOW MOLECULAR WEIGHT PTPASE COMPLEXED WITH HEPES 
1phr: THE CRYSTAL STRUCTURE OF A LOW MOLECULAR PHOSPHOTYROSINE PROTEIN PHOSPHATASE 
1pnt: CRYSTAL STRUCTURE OF BOVINE HEART PHOSPHOTYROSYL PHOSPHATASE AT 2.2 ANGSTROMS RESOLUTION 
1xww: Crystal Structure of Human B-form Low Molecular Weight Phosphotyrosyl Phosphatase at 1.6 Angstrom Resolution 
1z12: Crystal Structure of Bovine Low Molecular Weight PTPase Complexed with Vanadate 
1z13: Crystal Structure of Bovine Low Molecular Weight PTPase Complexed with Molybdate 
5pnt: CRYSTAL STRUCTURE OF A HUMAN LOW MOLECULAR WEIGHT PHOSPHOTYROSYL PHOSPHATASE. IMPLICATIONS FOR SUBSTRATE SPECIFICITY 
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