21. structure in expressions

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1、Structureinexpressions21.4(20k)−7Whichofthefollowingisequivalenttotheaboveexpression?2A.4(20+k)−72B.4-72C.20k⋅4−7D.-7CorrectAnswer:CDifficultLevel:22.(5j2k)3+(θ−3)Whichofthefollowingisequivalenttotheaboveexpression?A.(θ−3)+(125k3j6)B.(θ−3)+(5j2k3)C.(125k3j6)+(3−θ)D.(5

2、j2k3)+(3−θ)CorrectAnswer:ADifficultLevel:23.(4s2t)3+(p−3)Whichofthefollowingisequivalenttotheaboveexpression?A.(43s23t3)+(p−3)B.(p−3)+(4s2t3)C.(12s2t)+(p−3)D.(p−3)+(64s6t3)CorrectAnswer:DDifficultLevel:24.（）（）Giventheequationabove,whatisthevalueofc?CorrectAnswer:3Diff

3、icultLevel:25.A3+B3=(C+8y)(D−40xy+E)Apartialfactorizationofasumofcubesisgivenabove.WhichofthefollowingisequivalenttoA+B?A.13xyB.20x+2yC.2.5x+8yD.5x+8yCorrectAnswer:DDifficultLevel:26.Whichofthefollowingisequivalenttotheaboveexpressionforx≠y?A.2B.C.D.CorrectAnswer:ADif

4、ficultLevel:27.(n6k14)5Whichofthefollowingisequivalenttotheaboveexpression?A.(n2k5)3B.(n3)10(k2)7C.(n15k35)2D.(n5)5(k10)7CorrectAnswer:CDifficultLevel:28.Whichofthefollowingisequivalenttotheaboveexpression?A.B.C.D.CorrectAnswer:ADifficultLevel:29.Theexpression(x2+h2)(

5、x2−h2)canbewrittenas(1+m−p)x4−mpwhereh,m,p,andbareconstants.Whatisonepossiblevalueofm?A.1B.h2C.h4D.hCorrectAnswer:CDifficultLevel:210.(a+b+c)(a−b−c)Whichofthefollowingisequivalenttotheaboveexpression?A.a(b+c)−(a+b)cB.a2(b+c)−(a+b)c2C.a2−(b+c)2D.(a+b)2−c2CorrectAnswer:

6、CDifficultLevel:311.Whichofthefollowingisequivalenttotheaboveexpressionfora≠−b?A.1B.9C.D.CorrectAnswer:DDifficultLevel:312.Whichofthefollowingisequivalenttotheaboveexpression?A.B.C.D.CorrectAnswer:BDifficultLevel:313.(a+b+c)2Whichofthefollowingisequivalenttotheaboveex

7、pression?A.a2+b2+c2+2(ab+bc+ca)B.a2+b2+c2C.a2+2abc+c2D.a2+2ab+b2+2bc+c2CorrectAnswer:ADifficultLevel:314.Whichofthefollowingisequivalenttotheaboveexpression?A.B.C.yxD.CorrectAnswer:ADifficultLevel:315.Whichofthefollowingisequivalenttoxiftheaboveequationistrueforallm≠n

8、?A.B.C.m-nD.m+nCorrectAnswer:DDifficultLevel:416.(yt)6t−(lv)8vWhichofthefollowingisequivalenttotheaboveexpression?A.y6tt−l8v