下列计算正确的是 ( )
3 a 4 - a 4 = 3
( - 5 x 3 y 2 ) 2 = 10 x 6 y 4
( x + 1 ) ( x - 2 ) = x 2 - x - 2
( ab - 1 ) 2 = a 2 b 2 - 1
a 2 · a 2 = 2 a 4
( - a 2 ) 3 = - a 6
3 a 2 - 6 a 2 = 3 a 2
( a - 2 ) 2 = a 2 - 4
a 2 + a 3 = a 5
2 x 2 · ( - 1 3 xy ) = - 2 3 x 3 y
( a - b ) ( - a - b ) = a 2 - b 2
( - 2 x 2 y ) 3 = - 6 x 6 y 3
x 2 + 3 x 2 = 4 x 4
x 2 y · 2 x 3 = 2 x 4 y
( 6 x 3 y 2 ) ÷ ( 3 x ) = 2 x 2
( - 3 x ) 2 = 9 x 2
下列运算正确的是 ( )
( - a 5 ) 2 = a 10
2 a · 3 a 2 = 6 a 2
- 2 a + a = - 3 a
- 6 a 6 ÷ 2 a 2 = - 3 a 3
2 a + 3 a = 6 a
( - 3 a ) 2 = 6 a 2
( x - y ) 2 = x 2 - y 2
3 2 - 2 = 2 2
( - x 2 ) 3 = - x 5
x 2 + x 3 = x 5
x 3 · x 4 = x 7
2 x 3 - x 3 = 1
x 2 + x 4 = x 6
( - x 3 ) 3 = x 6
x 2 · x 3 = x 6
2 x 2 y - 2 y x 2 = 0
2 - 2 = - 4
4 = 2
2 a 3 + 3 a 2 = 5 a 5
( a 5 ) 2 = a 7
A . 8 - 2 = 2 B . ( - 3 ) 2 = 6 C . 3 a 4 - 2 a 2 = a 2 D . ( - a 3 ) 2 = a 5
( - 1 3 ) 2 + ( 1 2 ) 0 = 7 6
8 - 2 = 6
a 3 + a 2 = a 5
( - a 3 ) 2 = a 6
a 2 · a 3 = a 6
( a 2 ) 3 = a 6
( ab ) 2 = a b 2
若 2 n + 2 n + 2 n + 2 n = 2 ,则 n = ( )
- 1
- 2
0
1 4
a 2 + a 2 = a 4
( - b 2 ) 3 = - b 6
2 x · 2 x 2 = 2 x 3
( m - n ) 2 = m 2 - n 2
计算正确的是 ( )
( - 5 ) 0 = 0
( a b 2 ) 3 = a 2 b 5
2 a 2 · a - 1 = 2 a