下列计算正确的是( )
A.(﹣x3)2=x5B.(﹣3x2)2=6x4
C. ( - x ) - 2 = 1 x 2 D.x8÷x4=x2
下列计算正确的是 ( )
A. a 2 · a 3 = a 6 B. a 6 ÷ a - 2 = a - 3
C. ( - 2 a b 2 ) 3 = - 8 a 3 b 6 D. ( 2 a + b ) 2 = 4 a 2 + b 2
下列运算正确的是 ( )
A. a · a 4 = a 4 B. ( a 2 ) 3 = a 6
C. ( a 2 b 3 ) 2 = a 4 b 5 D. a 6 ÷ a 2 = a 3 ( a ≠ 0 )
A. a 8 ÷ a 4 = a 2 B. ( a 2 ) 2 = a 4
C. a 2 · a 3 = a 6 D. a 2 + a 2 = 2 a 4
下列运算正确的是( )
A.(a5)2=a10B.x16÷x4=x4
C.2a2+3a2=5a4D.b3•b3=2b3
A.2a+3b=5abB.2(2a﹣b)=4a﹣2b
C.(a2)3=a5D.a6÷a2=a3
A. a 3 · a 2 = a 6 B. ( − a 2 ) 3 = a 6
C. a 7 ÷ a 5 = a 2 D. − 2 mn − mn = − mn
A.(xy)3=xy3B.x5÷x5=x
C.3x2•5x3=15x5D.5x2y3+2x2y3=10x4y9
a 2 + a 3 = a 5
3 2 - 2 2 = 1
( x 2 ) 3 = x 5
m 5 ÷ m 3 = m 2
A. a 8 ÷ a 4 = a 2 B. ( 2 a 2 ) 3 = 6 a 6
C. 3 a 3 − 2 a 2 = a D. 3 a ( 1 − a ) = 3 a − 3 a 2
下列运算:① a 2 ⋅ a 3 = a 6 ,② ( a 3 ) 2 = a 6 ,③ a 5 ÷ a 5 = a ,④ ( ab ) 3 = a 3 b 3 ,其中结果正确的个数为 ( )
A.1B.2C.3D.4
a 2 · a 3 = a 6
( x + y ) 2 = x 2 + y 2
( a 5 ÷ a 2 ) 2 = a 6
( - 3 xy ) 2 = 9 x y 2
A . a 2 · a 3 = a 6 B . ( − a 2 ) 3 = − a 5
C . a 10 ÷ a 9 = a ( a ≠ 0 ) D . ( − bc ) 4 ÷ ( − bc ) 2 = − b 2 c 2
a 8 ÷ a 4 = a 2
5 a - 3 a = 2 a
( - a b 2 ) 2 = - a 2 b 4