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设计作品2587093
C.-a
D.a 2.下列各式中,与3x2y3是同类项的是( ) A.2x5
B.3x3y2
C.- x2y3
D.- y5 C C 3.下列计算正确的是( ) A.3a+2b=5ab
B.2ab-ba=ab C.5y2-2y2=3
D.3x2y-5xy2=2x2y 4.下列去括号正确的是( ) A.3(x+8)=3x+8 B.-(5x-3y)-(2x-y)=-5x+3y-2x+y C.y-2(x-1)=y-2x-2 D.3(2x-1)-2(x-1)=6x-3-2x-2 B B 5.若 x3yn+1与-3xm-1y5是同类项,则( ) A.m=4,n=4
B.m=2,n=4 C.m=-4,n=4
D.m=4,n=-4 6.已知M=x2+2xy+y2,N=x2-2xy+y2,则M-N等于( ) A.4xy
B.-4xy
C.2y2
D.4xy+2y2 A A 7.如果a2-ab=8,ab+b2=2,那么a2+b2的值是( ) A.10
B.6
C.-6
D.-10 8.已知A=2x2+3mx-x,B
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