ab |
ab |
ab |
a3b3 |
ab |
ab |
ab |
ab |
ab |
ab |
ab |
ab |
ab |
3 |
2 |
1 |
4 |
A.D,B,C,A | B.D、C、B、A | C.A,C,B,D | D.任意顺序 |
A.把a(b+c)与loga(x+y)类比,则有:loga(x+y)=logax+logay |
B.把a(b+c)与sin(x+y)类比,则有:sin(x+y)=sinx+siny |
C.把(ab)n与(a+b)n类比,则有:(x+y)n=xn+yn |
D.把(a+b)+c与(xy)z类比,则有:(xy)z=x(yz) |
A.b1b2…b9=29 | B.b1+b2+…+b9=29 |
C.b1b2…b9=2×9 | D.b1+b2+…+b9=2×9 |
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