A.系数是-3 | B.系数是-3×23 |
C.次数是5次 | D.次数是6次 |
A.-a(-a+b)=a2+ab |
B.x(-3x2+x-1)=-3x3+x2-1 |
C.5m-2m(m-1)=3m2-3m |
D.(y-2y2+1)(-3y)=6y3-3y2-3y |
a-b |
7 |
a2b |
π |
b |
a |
A.1个 | B.2个 | C.3个 | D.4个 |
A.-2x2(x+5y)=-2x3+10x2y | ||||
B.x(x-3)=x2-3x | ||||
C.(3x2+x+1)4x=12x3+4x2+4x | ||||
D.(
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