下列计算正确的是 ( )
3 a + 2 b = 5 ab
( a 3 ) 2 = a 6
a 6 ÷ a 3 = a 2
( a + b ) 2 = a 2 + b 2
下列运算正确的是 ( )
a 2 · a 3 = a 6
a 2 + a 3 = a 5
下列运算结果正确的是 ( )
3 x - 2 x = 1
x 3 ÷ x 2 = x
x 3 · x 2 = x 6
x 2 + y 2 = ( x + y ) 2
下列运算正确的是( )
a 2+a 3=a 5
(a 3) 2=a 5
(a•b) 2=a 2•b 2
a + b = a + b
下列运算中,正确的是 ( )
2 a + 3 a = 5 a
( a - b ) 2 = a 2 - b 2
7 + 3 = 10
( a 2 ) 3 = a 5
2 a + 3 a = 6 a
2 a · 3 a = 6 a 2
以下计算正确的是 ( )
( - 2 a b 2 ) 3 = 8 a 3 b 6
3 ab + 2 b = 5 ab
( - x 2 ) · ( - 2 x ) 3 = - 8 x 5
2 m ( m n 2 - 3 m 2 ) = 2 m 2 n 2 - 6 m 3
( - 2 ) 3 = 8
( a 2 ) 3 = a 6
4 x 2 - 2 x = 2 x
下列各式中,计算正确的是 ( )
8 a - 3 b = 5 ab
a 8 ÷ a 4 = a 2
a 2 · a = a 3
下列运算,正确的是 ( )
2 x + 3 y = 5 xy
( x - 3 ) 2 = x 2 - 9
( x y 2 ) 2 = x 2 y 4
x 6 ÷ x 3 = x 2
3 a 2 + a = 3 a 3
a 5 ÷ a 2 = a 3 ( a ≠ 0 )
a ( a + 1 ) = a 2 + 1
a 6 ÷ a 3 = a 3
a 4 · a 2 = a 8
( 2 a 2 ) 3 = 6 a 6
a 2 + a 2 = a 4
下列计算错误的是 ( )
( a 3 b ) · ( a b 2 ) = a 4 b 3
( - m n 3 ) 2 = m 2 n 6
a 5 ÷ a - 2 = a 3
x y 2 - 1 5 x y 2 = 4 5 x y 2
a 6 + a 6 = 2 a 12
2 - 2 ÷ 2 0 × 2 3 = 32
( - 1 2 a b 2 ) · ( - 2 a 2 b ) 3 = a 3 b 3
a 3 · ( - a ) 5 · a 12 = - a 20
a 3 - a 2 = a
a 3 ÷ a 2 = a