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+
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