①下列计算正确的是( )A (-3x)^2=-9x^2 B.(-3x)^2=9x^2 C.(-3)^2= -6x^2 D(-3x)^2=6x^2②计算a(-2a)^3 · (a^2)^5的结果是( )(要化简)③如果(x^3y^n)^2=x^6 y^8,则n等于( ).④已知2^x=a.2^y=b.求(2^x+y)+(2^3x+
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![①下列计算正确的是( )A (-3x)^2=-9x^2 B.(-3x)^2=9x^2 C.(-3)^2= -6x^2 D(-3x)^2=6x^2②计算a(-2a)^3 · (a^2)^5的结果是( )(要化简)③如果(x^3y^n)^2=x^6 y^8,则n等于( ).④已知2^x=a.2^y=b.求(2^x+y)+(2^3x+](/uploads/image/z/12511375-7-5.jpg?t=%E2%91%A0%E4%B8%8B%E5%88%97%E8%AE%A1%E7%AE%97%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%EF%BC%88+%EF%BC%89A+%EF%BC%88-3x%EF%BC%89%5E2%3D-9x%5E2+B.%28-3x%29%5E2%3D9x%5E2+C.%EF%BC%88-3%EF%BC%89%5E2%3D+-6x%5E2+D%28-3x%29%5E2%3D6x%5E2%E2%91%A1%E8%AE%A1%E7%AE%97a%28-2a%29%5E3+%C2%B7+%28a%5E2%29%5E5%E7%9A%84%E7%BB%93%E6%9E%9C%E6%98%AF%EF%BC%88+%EF%BC%89%EF%BC%88%E8%A6%81%E5%8C%96%E7%AE%80%EF%BC%89%E2%91%A2%E5%A6%82%E6%9E%9C%EF%BC%88x%5E3y%5En%29%5E2%3Dx%5E6+y%5E8%2C%E5%88%99n%E7%AD%89%E4%BA%8E%EF%BC%88+%EF%BC%89.%E2%91%A3%E5%B7%B2%E7%9F%A52%5Ex%3Da.2%5Ey%3Db.%E6%B1%82%282%5Ex%2By%29%2B%282%5E3x%2B)
①下列计算正确的是( )A (-3x)^2=-9x^2 B.(-3x)^2=9x^2 C.(-3)^2= -6x^2 D(-3x)^2=6x^2②计算a(-2a)^3 · (a^2)^5的结果是( )(要化简)③如果(x^3y^n)^2=x^6 y^8,则n等于( ).④已知2^x=a.2^y=b.求(2^x+y)+(2^3x+
①下列计算正确的是( )A (-3x)^2=-9x^2 B.(-3x)^2=9x^2 C.(-3)^2= -6x^2 D(-3x)^2=6x^2
②计算a(-2a)^3 · (a^2)^5的结果是( )(要化简)
③如果(x^3y^n)^2=x^6 y^8,则n等于( ).
④已知2^x=a.2^y=b.求(2^x+y)+(2^3x+2y)的值
⑤已知x^n=2.y^n=3,求(x^2y)^2n 的值
①下列计算正确的是( )A (-3x)^2=-9x^2 B.(-3x)^2=9x^2 C.(-3)^2= -6x^2 D(-3x)^2=6x^2②计算a(-2a)^3 · (a^2)^5的结果是( )(要化简)③如果(x^3y^n)^2=x^6 y^8,则n等于( ).④已知2^x=a.2^y=b.求(2^x+y)+(2^3x+
①下列计算正确的是(B)A (-3x)^2=-9x^2 B.(-3x)^2=9x^2 C.(-3)^2= -6x^2 D(-3x)^2=6x^2
②计算a(-2a)^3 · (a^2)^5的结果是(8a^14)(要化简)
③如果(x^3y^n)^2=x^6 y^8,则n等于( 4 ).
④已知2^x=a.2^y=b.求(2^x+y)+(2^3x+2y)的值:a+3log(2,b)+8log(2,a)
⑤已知x^n=2.y^n=3,求(x^2y)^2n 的值:[2^(2/n)3^(1/n)]^2n=2^(4/n)3^(2/n)n
选C.
A、a^2+a^2=2a^2
B、a^2*a^3=a^5
D、(-ab^2)^2=a^2b^4