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1.6第1课时完全平方公式的认识一、选择题1.(2x-1)2等于()A.4x2-4x+1B.2x2-2x+1C.2x2-1D.2x2+12.(x+5y)2等于()A.x2-5y2B.x2+10x+25y2C.x2+10xy+25y2D.x2+x+25y23.(m-5)2等于()A.m2-5B.m2-52C.m2-10m+25D.25m2-54.(x+5y)2等于()A.x2-5y2B.x2-10y+5y2C.x2+10xy+25y2D.x2-y+25y25.(2x-y2)2等于()A.2x2-4xy2+y4B.4x2-2xy2+y4C.4x2-4xy2+y4D.4x2-xy2+y46.下面计算正确的是()A.(a+b)(a-b)=2a+2bB.b5+b5=b10C.x5.x5=x25D.(y-z)2=y2-2yz+z27.下面计算错误的是()A.(y-z).(y+z)=y2-z2B.(m-n)2=n2-m2C.(y+z)2=y2+2yz+z2D.(y-z)2=y2-2yz+z28.(2y-3z)2等于()A.4y2-12yz+z2B..y2-12yz+9z2C.4y2-12yz+9z2D..4y2-6yz+9z29(3z-y)2等于()A.9z2-y+y2B.9z2-yz+y2C.9z2-6yz+y2D.3z2-6yz+y210(x+3ab)2等于()A.x2+6xab+9a2b2B.x2+6ab+9a2b2C.x2+xab+9a2b2D.x2+6xab+a2b211(c-a2b2)2等于()A.c-ab2B..c2-2a2b2c+a4b4C.c-a2b2c+a4b4D.c2-2abc+a4b 12[c-(a2)2]2等于()A.c-a2B.c2-2a4c+a8C.c2-a2D.c2-a413.[(c2)2+(a2)2]2等于()A.c8+2ac4+a8B.c8+2a4c+a8C.c8+2a4c4+a8D.c8+a4c4+a814.(c+a)2等于()A.c3-a3B.a2+2ac+c2C.c5-a5D.c2-2ac+a215.(d+f)2等于()A.d3-f3B.d2+2df+f2C.d2-2f+f2D.d2-df+f2二.填空题.1.(5-x2)2等于;2.(x-2y)2等于;3.(3a-4b)2等于;4.(2b-2c)2等于;三、计算题1.(3a-b)(3a+b)-(a+b)22.(a-b)2-3(a2+b2) 3.2(a2+b2)-(a+b)24.(3a-b)(3a+b)-(2a-b)2答案:一、选择题1.A2.C3.C4.C5.C6.D7.B8.C9.C10.A11.B12.B13.C14.B15.B二、填空题.1.25-10x2+x42.x2-8xy+4y23.9a2-24ab+16b24.4b2-8bc+4c2三、计算题1.解:(3a-b)(3a+b)-(a+b)2=9a2-b2-a2-b2-2ab=8a2-2b2-2ab2.解:(a-b)2-(a2+b2)=a2-2ab+b2-3a2-3b2=-2a2-2ab-2b23.解:(a-b)(a+b)-a2+b2=2a2-2b2-a2-2ab-b2=a2-2ab+b24.解:(3a-b)(3a+b)-(2a-b)2=9a2-b2-4a2+4ab-b2=5a2+4ab-2b2 查看更多

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